Question

dada a funçao f(x)=3x+1,calcule f(2)+ f(-4)

Answer 1

f(2) = 3.2+1
f(2) = 6 + 1
f(2) = 7

f(-4) = 3.(-4) + 1
f(-4) = -12 + 1
f(-4) = -11

f(2) + f(-4) = 7 + (-11) 
f(2) + f(-4) = 7 - 11
f(2) + f(-4) = -4