Find the value of x. Round your answer to the nearest tenth. A.4.0
B.4.6
C.13.9
D. 16.0

Find the value of x. Round your answer to the nearest tenth.

A.4.0
B.4.6
C.13.9
D. 16.0

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Ответ:

yessy73

14.01.2020

Mathematics

(-2,0)

Set up quadratic

$y = 5 {x}^{2} + 5x - 10$

Divide each coefficient by 5

$y = {x}^{2} + x - 2$

Factor using AC method.

Think of a number that multiply -2 and add to 1. The answer is -1 and 2.

So we write the equation as

(x - 1)(x +2 )

Set each parenthesis to zero.

x = 1

x = - 2

The other zero is -2

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Find the value of x. Round your answer to the nearest tenth. A.4.0 B.4.6 C.13.9 D. 16.0