Question

Dada a função f(x)=5-2x calcule:A) f(5/2) b)f (x)=19

Answer 1

a) f(5/2) = 5-2.5/2 = 5-10/2 = 5-5 = 0
b) f(x) = 19

5-2x= 19
-2x = 19-5
-2x = 14 (.-1)
2x = -14
x = -14/2
x = -7