Answer:
listen to romap they are correct
Explanation:
Given,
f(x)=4x^2-9
g(x)=2x+3
1.
(f+g)(x)=f(x) + g(x)
=4x^2-9+2x+3
=4x^2+2x-6
2.
(f-g)(x)=f(x)-g(x)
4x^2-9-2x-3
=4x^2-2x-12
when x=3, then,
f(3)=4×(3)^2-9=27
g(3)=2×3+3=9
5.
f(g(3))=f(9)=4×(9)^2-9
=312
g(f(3))=g(27)=2×27+3=57
7.1m questions
9.5m answers