Question

If f:N$\to$N be a function defined by f(x) = $x^2$ + x, then find f(-2).f(2) + f(3).

Answer 1

f:N$\to$N is a function defined by f(x) = $x^2$ + x

f(-2) = $(-2{)}^2$ + (-2) = 4 – 2 = 2

f(2)= $2^2$ + 2 = 4 + 2 = 6

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

f(-2).f(2) + f(3) = 2 $\times$ 6 + 12 = 24