2 years ago

3x + (2 + x) + 5 times 2

Mathematics

1 answer:

Gennadij [26K]2 years ago

4 0

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3 years ago

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

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Answer:

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

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

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Step-by-step explanation:

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$5x^2+20x-7=0$

step 1

Group terms that contain the same variable, and move the constant to the opposite side of the equation

$5x^2+20x=7$

step 2

Factor 5 left side

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

step 3

Complete the square

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$5(x^2+4x+4)=27$

step 4

Rewrite as perfect squares

$5(x+2)^2=27$

step 5

$(x+2)^2=\frac{27}{5}$

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step 6

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