Question

Dengan memfaktorkan tentukan:
a) 9x^2 - 81 = 0
b) x^2 + 6x = 0
c) x^2 - 5x + 6 = 0
d) 5x^2 - 7x + 2 = O

Answer 1

A) 9x² - 81 = 9(x² - 9)
9(x + 3)(x - 3) = 0
x = - 3 atau x = 3

b) x² + 6x = 0
x(x + 6) = 0
x = 0 atau x = - 6

c) x² - 5x + 6 = 0
(x - 2)(x - 3) = 0
x = 2 atau x = 3

d) 5x² - 7x + 2 = 0
(5x - 2)(x - 1) = 0
x = 2/5 atau x = 1