Question

let F(x)=x^2-10 and G(x)=11-x Find (F-G)(2)

Answer 1

$f(x) = {x}^{2} - 10$
$g(x) = 11 - x$
then
$(f - g)(x) = f(x) - g(x) \\ = {x}^{2} - 10 - (11 - x) \\ = {x}^{2} + x - 21$
so
$(f - g)(2) = {2}^{2} + 2 - 21 \\ = 4 + 2 - 21 \\ = - 15$