Question

Sendo f(x) = 3x - 12, determine:

a) f(3) b) f (-4)

Answer 1

f(x) = 3x - 12

a) f(3)
f(3) = 3×3 - 12
f(3) = 9 - 12
f(3) = -3

b) f(-4)
f(-4) = 3×(-4) - 12
f(-4) = (-12) - 12
f(-4) = -24

Answer 2

f(x)=3x-12

a)f(3)
f(3)=3*3-12
f(3)=9-12
f(3)=--3

b)f(-4)
f(-4)=3*(-4)-12
f(-4)=-12-12
f(-4)=-24