Question

Calcule o zero de cada função
A) f (x) = 3x - 12
B) f (x) = - x + 9
C) f (x)= 2x + 16
D) f (x)= x-20

Answer 1

A) f (x) = 3x - 12
3x-12 = 0
3x = +12
x = 12/3 = 4

B) f (x) = - x + 9
-x+9 = 0
-x = -9 (×-1)
x = 9

C) f (x)= 2x + 16
2x+16 = 0
2x = -16
x = -16/2 = -8

D) f (x)= x-20
x-20 = 0
x = 20