EXPLANATION
g(x) = x^2-1
Doing x= h+2 and simplifying, this will give us:
g(h+2) = (h+2)^2 - 1
= h^2 + 2*2*h +2^2 - 1
= h^2 +4h +4 - 1
= h^2 + 4h + 3
[ANSWER] is:
a) h^2 + 4h + 3
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