Answer:

Explanation:
Given:

Solution:
When x=-2

=4+8+4
=16
The first one is not 12 as we get 16 while solving the number.

When x=0

=0+0+4
=4
The second one is correct as we get 4 while solving.

When f(x)=4
it means

Doing middle term Factorization:

taking common from each two terms

square rooting on both sides

x-2=2
x=2+2
x=4
The third one is correct as we get 4 while solving.