find (f+g)(x) and(f+g)(7)

Question

f(x)=x²-5x and g(x)=4-x

find (f+g)(x)and(f+g)(7)

(f+g)(x)=

Answer 1

f(7) = 7^2 - 5(7) = 49 - 35 = 14

g(7) = 4 - 7 = -3

f(7) + g(7) = 14 + -3 = 11

(f+g)(x) = x^2 - 5x + 4 - x = x^2 - 6x + 4

(f+g)(7) = 7^2 - 6(7) + 4 = 49 - 42 + 4 = 7+4 = 11