Question

Find the value of f(-4) if f(x) = x^2 + 7.

Answer 1

\[f(x) = x^2 + 7 \implies f(y) = y^2 + 7\implies f(z) = z^2 + 7\implies \cdots\]\[\implies f(-4) = (-4)^2 + 7\]

Answer 2

@cyprus23 you keep asking the same "plug and play" stuff. Why don't show us how do you do it.