Question

f(x)=4x-1 caucule: f(3).f(4)

Answer 1

f(x)=4x-1
f(3)=4.3-1
f(3)=12-1
f(3)=11
f(x)=4x-1
f(4)=4.4-1
f(4)=16-1
f(4)=15
f(3).f(4)
11.15=165