Question

Dada a função f(x)=-2×-3determine: f(1) f(0) f (-3)

Answer 1

f(1) = -2.(1) - 3
f(1) = - 2 - 3
f(1) = -5

f(0) = -2.(0) - 3
f(0) = 0-3
f(0) = -3

f(-3) = -2.(-3) - 3
f(-3) = 6-3
f(-3) = 3                                 ok

Answer 2

f(x) = - 2x - 3 ==> f(1) = -2x1 - 3 ==> f(1)  = -2- 3 ==> f(1) = - 5 
==>  f(0) = -2x0 - 3 ==> f(0) = 0 - 3 ==> f(0) = - 3
==> f(-3) = -2x(-3) -  3 ==> f(-3) = 6 -  3 ==> f(-3) = 3