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x = 0 atau x = - 6
b) 2x² - 8x -12 = 0
2(x² - 4x - 6) = 0
x²- 4x = 6
(x - 2)² = 6 + 4 = 10
x = 2 +- √10
c) 2x² + 5x + 3 = 0
(2x +3)(x + 1) = 0
x = - 3/2 atau x = - 1
d) x² + 2x - 35 = 0
(x + 7)(x - 5)= 0
x = - 7 atau x= 5