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x^2 - 36 = 0
x^2 - 6^2 = 0
(x+6)(x-6) = 0
x = -6 atau x = 6
b.
6x^2 + x - 15 = 0
6x^2 + 10x - 9x - 15 = 0
2x(3x + 5x) - 3(3x + 5x) = 0
(2x - 3)(3x + 5) = 0
2xa - 3 = 0
2xa = 3
xa = 3/2
3xb + 5 =0
3xb = -5
xb = -5/3
maka x = 3/2 atau x = -5/3
Sekian ^_^