Select the two values of x that are roots of this equation.
x² + 2x - 4 = 0
O A. x= -1 - 15
B. x= -1+5
C. X=-1-215
D. x = -1+2-15

Answer:

[tex]\frac{b}{4}+2=-1[/tex]

Subtract 2 from both sides:

[tex]\frac{b}{4}+2-2=-1-2[/tex]

[tex]\frac{b}{4}=-3[/tex]

Multiply 4 to both sides:

[tex]4*\frac{b}{4} =-3*4[/tex]

[tex]b=-12[/tex]

Answer:

−7.6n+9.7

Step-by-step explanation:

First, lets put the equation

≈3.7 - 4.6n - 3n + 6

Add light terms

−7.6n + 9.7

Now were done

Answer:

c

Step-by-step explanation:

c represents adding 5 and n together, and multiplying it by four.

Four times the sum of five and a number equivalent expression is 4(5 + n) which is the correct answer would be an option (C).

Expressions are defined as mathematical statements that have a minimum of two terms containing variables or numbers.

Arithmetic operations can also be specified by adding, subtracting, dividing, and multiplying built-in functions.

The operator that performs arithmetic operations is called arithmetic operator.

Operators let do basic mathematical calculations.

+ Addition operation: Adds values on either side of the operator.

For example 4 + 2 = 6

Let the number be n

To determine the four times the sum of five and a number

The sum of five and a number as

⇒ 5 + n

So, four times the sum of five and a number as

⇒ 4*(5 + n)

Hence, four times the sum of five and a number equivalent expression is  4(5 + n).

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Answer:

r = ± [tex]\sqrt{q^2-p^4[/tex]

Step-by-step explanation:

p² = [tex]\sqrt{q^2-r^2}[/tex] ( square both sides )

(p² )² = q² - r²

[tex]p^{4}[/tex] = q² - r² ( subtract q² from both sides )

[tex]p^{4}[/tex] - q² = - r² ( multiply through by - 1 )

q² - [tex]p^{4}[/tex] = r² ( take square root of both sides )

± [tex]\sqrt{q^2-p^4}[/tex] = r

Step-by-step explanation:

so as ∆BCE is a right angled triangle

angle BEC = 90°

angle CBE = 22° (given)

apply angle sum property of triangle

so according to that

BCE + CBE + ECB = 180

22° + 90° + ECB = 180

102° + ECB = 180

ECB = 180 - 102

ECB = 78°

and also we know, that exterior angle of a triangle is equal to 2 interior angle of triangle,

so ,

x = 78°

hope this answer helps you dear! take care

Answer:

answer is 2

Step-by-step explanation:

funny pic

Answer:

112

Step-by-step explanation:

8 days when fitted into a half (1/2) gives you 16

7 times 16 gives the answer of 112 (people needed)

Answer:

112 people to do it in 1/2 of a day

Step-by-step explanation:

7 · 8 = 56

56 ÷ ½ = 112 people to dig a ditch in 1/2 of a day

Answer:

4 an 5

Step-by-step explanation:

Answer:

15/8 and 1 7/8

35/4 and 8 3/4

40/12 and 3 1/3

Step-by-step explanation:

15/8 and 1 7/8:

Convert the improper fraction into a mixed number: [tex]\frac{8+7}{8}[/tex]

Calculate the sum or difference: [tex]\frac{15}{8}[/tex]

Check equivalency: True

Answer: True

=================================================================

35/4 and 8 3/4

Convert the improper fraction into a mixed number:  [tex]\frac{8*4+3}{4}[/tex]

Calculate the product or quotient: [tex]\frac{32+3}{4}[/tex]

Calculate the sum or difference: [tex]\frac{35}{4}[/tex]

Check equivalency: True

Answer: True

================================================================

23/6 and 4 1/6

Convert the improper fraction into a mixed number: [tex]\frac{4*+1}{6}[/tex]

Calculate the product or quotient: [tex]\frac{24+1}{6}[/tex]

Calculate the sum or difference: [tex]\frac{25}{6}[/tex]

Check equivalency: False

Answer: False

===============================================================

40/12 and 3 1/3

Reduce the fraction: 10/3

Convert the improper fraction into a mixed number: [tex]\frac{3*+1}{3}[/tex]

Calculate the product or quotient: [tex]\frac{9+1}{3}[/tex]

Calculate the sum or difference: [tex]\frac{10}{3}[/tex]

Check equivalency: True

Answer: True

================================================================

11/4 and 2 1/2

Convert the improper fraction into a mixed number: [tex]\frac{2*+1}{2}[/tex]

Calculate the product or quotient: [tex]\frac{4+1}{2}[/tex]

Calculate the sum or difference: [tex]\frac{5}{2}[/tex]

Check equivalency: False

Answer: False

Answer:

SSS

Step-by-step explanation:

The two triangles share DT so they must be congruent

Answer:

(x/y)^2n-2n

(x/y)⁰

=1

since any number raised to power of 0 is 1

Answer:

c

Step-by-step explanation:

Answer:

c

Step-by-step explanation:

Option D is correct, the value of the rational expression when x = –3 is undefined.

An expression is combination of variables, numbers and operators.

The given expression is x/x²-9

x divided by x square minus nine.

Now let us find the value of the expression when x is minus three,

Plug in x as -3 in the above expression.

-3/(-3)²-9

-3/9-9

-3/0

Anything divided by zero then the value is undefined.

Hence, Option D is correct, the value of the rational expression when x = –3 is undefined.

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What is the value of the rational expression x/x2-9 when x = –3?

A. -1/12

B. 0

C. 1/6

D. Undefined

Answer:

125.1698 Ft

Step-by-step explanation:

Answer:

36, 14, -12

variable

Step-by-step explanation:

1st Rate of change is 18 - 0 / 0.5 - 0 = 18/0.5 = 36

2nd rate of change is 32 - 18 / 1.5 -0.5 = 14 / 1 = 14

3rd rate of change is 26 - 32 / 2 - 1.5 = -6/0.5 = -12

so the rates of change are variable

Answer:

3

Step-by-step explanation:

Answer:

the negative 5 is showing that you are losing grain in the silo because you are letting some out.

Answer:

Imagine that scientists have just discovered a non-bird dinosaur skeleton. They want to know whether the dinosaur was closely related to birds. What features in ...

Step-by-step explanation:

Answer:

x + 9y²

Step-by-step explanation:

A prime polynomial is simply an irreducible polynomial.

x + 9y² is a prime polynomial

First, we test the options.

x + 9y²

The above function cannot be reduced further.

Hence, x + 9y² is a prime polynomial

3m + 9n

Factor out 3

3 (m + 3n)

3m + 9n is not a prime because it can be factored as 3 (m + 3n)

8x^7 - 9x + 12x²

Factor out x

x(8x^6 - 9 + 12x)

8x^7 - 9x + 12x² is not a prime because it can be factored as x(8x^6 - 9 + 12x)

Hence, x + 9y² is a prime polynomial

Answer: that equals to 1.6

Step-by-step explanation:

Answer:

what do you need help with

Answer:

rope 1=4m ,rope2=12m ,rope3=48m

Step-by-step explanation:

let the first number be y .second be 3y.third be 4(3y).y+3y+4y=64

after adding use substitution.

Answer:

i need help with this one too

Step-by-step explanation:

Answer:

2 inches

Step-by-step explanation:

I hope it helps you!

Answer:

22

Step-by-step explanation:

it's 22 percent I don't get how do u need help

Answer:

(-2.5,3) is x1 y1 respectivelly. Apart from this, what part of the question are you struggling with?

Answer:

9 dollars

Step-by-step explanation:

cuz 9 dollars

Answer:

Ratios are basically proportions so in this scenario

We can make it…

brick layers : hours

We’re given the first one which is

3:2

Whilst the one we need to find is only given for brick

For the unknown hours we can make it “x”

4: x

Now we have 2 ratios

3:2

4:x

Now these are fractions and we can make them equal to each other by

3/2 = 4/x

Now cross multiply to solve for x

3x=8

2 2/3 = x

So 2 2/3 hours

im  not sure sorryyyyyyyyyyyyyyy

The student went from x+y = 2 to 2x+2y = 2, which is not correct. They multiplied the left side by 2, but forgot about the right hand side.

They should have gone from x+y = 2 to 2x+2y = 4 after multiplying both sides by 2.

So they should have this new equivalent system

[tex]\begin{cases}3x-2y = 8\\2x+2y = 4\end{cases}[/tex]

Add straight down and we end up with the new equation 5x = 12 which solves to x = 12/5 = 2.4

Use that x value to solve for y. You should get y = -2/5 = -0.4