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OverLord2011 [107]
3 years ago
9

Sergey is solving 5x2 + 20x – 7 = 0. Which steps could he use to solve the quadratic equation by completing the square? Check al

l that apply. 5(x2 + 4x + 4) = –7 + 20 x + 2 = 5(x2 + 4x) = 7 5(x2 + 4x + 4) = 7 + 20 5(x2 + 4x) = –7 x + 2 =
Mathematics
2 answers:
Readme [11.4K]3 years ago
8 0

Answer:

5(x^2+4x)=7

Option 2 and 3 is correct.

Step-by-step explanation:

Case (I).

Given equation is

5x^2+20x-7=0

Firstly, we will add of 7 in both sides

5x^2+20x-7+7=7

Now, same variable of opposite sign is cancelled

5x^2+20x=7

Now, taking 5 common from left side

5(x^2+4x)=7

Case (II).

Given equation

5x^2+20x-7=0

Firstly, we will add of 7 in both sides

5x^2+20x=7

Now, we will add of 20 in both sides

5x^2+20x+20=7+20

Now, taking common of 5 from left side

5(x^2+4x+4)=7+20

So, The next step on solving completing square is 5(x^2+4x)=7 and 5(x^2+4x+4)=7+20

Dahasolnce [82]3 years ago
4 0

Answer:

2,3,4 are the answers on edge

Step-by-step explanation:

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Answers for the 2 boxes please :)​
jek_recluse [69]

Answer:

(0, 3 )

Step-by-step explanation:

Given the 2 equations

x + 3y = 9 → (1)

- 2x + 2y = 6 → (2)

Multiplying (1) by 2 and adding to (2) will eliminate the x- term

2x + 6y = 18 → (3)

Add (2) and (3) term by term to eliminate x, that is

0 + 8y = 24

8y = 24 ( divide both sides by 8 )

y = 3

Substitute y = 3 into either of the 2 equations and solve for x

Substituting into (1)

x + 3(3) = 9

x + 9 = 9 ( subtract 9 from both sides )

x = 0

solution is (0, 3 )

7 0
3 years ago
Read 2 more answers
If `f(x)=x^2-81` and `g(x)=(x-9)^(-1)(x+9)`, find `g(x)xxf(x)`.
marshall27 [118]

<u>Answer:</u>

g ( x ) * f ( x ) = ( x + 9 ) ^ 2

<u>Step-by-step explanation:</u>

We are given the following two functions and we are to find g(x) * f(x):

f(x)=x2-81

g(x)=(x - 9)^{-1} ( x + 9)

g(x)*f(x)=x^{-81} * \frac{x+9}{x-9}

g ( x ) * f ( x ) =\frac{(x+9)(x-9)(x+9)}{x-9}

g ( x ) * f ( x ) = ( x + 9 ) ( x + 9 )

g ( x ) * f ( x ) =( x + 9 ) ^ 2

3 0
3 years ago
Read 2 more answers
12.5(7) + 11.9(8)=?
BaLLatris [955]

Answer:

182.7

Step-by-step explanation:

7 0
3 years ago
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Find the point on the parabola y^2 = 8x at which the ordinate is double the abscissa.​
aliya0001 [1]

Answer:

Step-by-step explanation:

Let's make a complex of functions

y^2 = 8x

y = 2x

Now let's solve it

(2x)^2 = 8x

4x^2 - 8x = 0

4x(x - 2) = 0

x = 0, 2

y = 0, 4

So the answer is (2, 4)

Hope you like it, study well

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3 years ago
PLSSSS HELPP MEE ASPAPP
anzhelika [568]
Number 3 is there the problem go’s wrong. It should calculate 12 to the peer of two and the get 144 and then divide 144 by 6 to get 24 and then multiply 24 and 4 to get 96
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