Question

Dada a função do 1 grau f(x)=5x-12, determine o valor de x para que:
a) f(x)= 3
b) f(x)= -7
c) f(x)= 8
d) f(x)= 0

Answer 1

f(x) = 5x - 12

a) 5x - 12 = 3

5x = 3 + 12

5x = 15

x = 15/5

x = 3

b) 5x - 12 = - 7

5x = - 7 + 12

5x = 5

x = 5/5

x = 1

c) 5x - 12 = 8

5x = 8 + 12

5x = 20

x = 20/5

x = 4

d) 5x - 12 = 0

5x = 12

x = 12/5