2 years ago

Which of the following is a solution of x^2 - 2x = -8?

1 answer:

6 0

X^2-2x=-8 add 1 to both sides

x^2-2x+1=-7 now the left side is a perfect square

(x-1)^2=-7 take the square root of both sides

x-1=±√-7 add 1 to both sides

x=1±√-7 which is

x=1±i√7 so

x=1+i√7 and 1-i√7

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Step-by-step explanation:

This question is telling us that x = -3. Knowing this, we can plug x into the equation and solve to find g(-3).

$g(-3) = 3(-3)^{2} -4$

$g(-3) =3(9)-4$ Square -3 to get 9

$g(-3) = 27-4$ Multiply 9 by 3 to get 27

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Thus, g(-3) is equal to 23.

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