Question

Which equations are true for x = –2 and x = 2? Check all that apply.

Answer 1

Answer:

A & D

Step-by-step explanation:

I just took the test, the answers are A & D.

Answer 2

Answer:

Only first and fourth equations are true for x = –2 and x = 2.

Step-by-step explanation:

We have to check which equations are true for x = –2 and x = 2. Let us substitute these values in the given equations and see which equation satisfies the point.

(A)

For x= 2

$(2)^2-4=4-4=0$

For x= -2

$(-2)^2-4=4-4=0$

This equation is true for x = –2 and x = 2.

(B)

For x= 2

$(2)^2=4$

This equation is not true for x = –2 and x = 2.

(C)

For x= 2

$3(2)^2+12=12+12=24$

This equation is not true for x = –2 and x = 2.

(D)

For x= 2

$4(2)^2-16=16-16=0$

For x= -2

$4(-2)^2-16=16-16=0$

This equation is true for x = –2 and x = 2.

(E)

For x= 2

$2(2-2)^2=0$

For x= -2

$2(-2-2)^2=32$

Second point doesn't satisfy the equation.

Hence, this equation is not true for x = –2 and x = 2.

Therefore, only first and fourth equations are true for x = –2 and x = 2.