Question

Calcule as raizes das funções abaixo :

A) y = 5x - 30
B) y = 2x + 12
C) y = 3x - 81
D) y = 7x - 7
E) y = 3x - 1/3
F) y = - 12x + 3/4

Answer 1

A) y = 5x - 30
5x - 30 = 0
5x = 30
X = 30⁄5 = 6

B) y = 2x + 12
2x + 12 = 0
2x = -12
X = -12⁄2 = -6

C) y = 3x - 81
3x - 81 = 0
3x = 81
X = 81⁄3 = 27

D) y = 7x - 7
7x - 7 = 0
7x = 7
X = 7⁄7 = 1

E) y = 3x - 1⁄3
3x - 1⁄3 = 0
3x = 1⁄3
X = 1⁄3 × 1⁄3 = 1⁄9

F) y = - 12x + 3/4
-12x + 3⁄4 = 0
-12x = -3⁄4 ×(-1)
12x = 3⁄4
X = 3⁄4 × 1⁄12 = 3⁄48 = 1⁄16