Question

sendo f(x)=5.x-3 calcule f(-1)

Answer 1

f(x) = 5x - 3
f(- 1) = 5.(-1) - 3
f(-1) = - 5 - 3
f(-1) = - 8

Answer 2

sendo f(x)=5.x-3 
f(-1)=5(-1)-3
f(-1)=-5-3
f(-1)=-8