Question

Given that f(x)=x+2 and g(x)=x^2-2, find (f+g)(-4)​

Answer 1

12

Explanation:

note that (f + g)(x) = f(x) + g(x)

f(x) + g(x) = x + 2 + x² - 2 = x² + x

To evaluate (f + g)(- 4) substitute x = - 4 into f(x) + g(x)

(f + g)(- 4) = (- 4)² + (- 4) = 16 - 4 = 12