Expand $x^2 + 2x + 3$ and x = -2.
Answer & explanation
Correct answer: option 3
Given,
x2 + 2x + 3
x = –2
If x = – 2
then x + 2 = 0
Now we have to expand only options 2 and 3,
As in options 1 and 4, the first term is (x - 2)
From option 2,
= (x + 2)2 – 2(x + 2) + 3
= x2 + 4x + 4 - 2x - 4 + 3
= x2 + 2x + 3 ( satisfied)
So the answer will be = (x + 2)2 + 2 (x + 2) + 3