Question

seja a função f:R>R,definida por f(x)=-2x-6.Calcule os valores de x para obter:
a)f(x)=8
b)f(x)=-25
c)f(x)=0

Answer 1

a) -2x-6=8
-2x=8-6
-2x=2
x=2/-2
x=-1

b)-2x-6=-25
-2x=-6-25
-2x=-31
x=31/2

c)-2x-6=0
-2x=6
x=6/-2
x=-3