Question

sendo f(x) =x -4x calcule
A) f(-2)=
B) f(5) +f(3)

Answer 1

f(x)= x-4x
f(x)= -3x

a) f(-2)= -3.(-2)= +6

b) f(5)= -3.(5)= -15
f(3)= -3.(3)= -9

f(5)+f(3)=
-15+(-9)=
-15-9=
-24