Question

Dada a função f(x)=4x+20. calcule:
A )f(9)-f(1)
B) f(4)-f(-2)
C) f(-5)+f(3)
D) f(2)+f(6)

Answer 1

A) f(9)= 4 . 9+20=56
f(1)=4 . 1+20=24
56-24=32

B) f(4)= 4 . 4+20= 36
f(-2)= 4 . -2+20=12
36-12= 24

C) f(-5)= 4 . -5+20=0
f(3)= 4 . 3+20= 32
0+32= 32

D) f(2)= 4 . 2+20= 28
f(6)= 4 . 6+20= 44
28+44= 72