Question

1) g(a)=a³+5a²
f(a)=2a +4
Find g(3) + f(3)

Answer 1

82

Explanation:

if g(3)= substitute a as 3 = (3)^3 +5(3)^2= 27+45= 72

if f(3)= substitute a as 3= 2(3) +4=10

join them up since it said there to add g(3) +f(3)

72 +10= 82