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(x-1)/2 = x^2 + 2x - 3
2x^2 + 4x - 6 = x - 1
2x^2 + 3x - 5 = 0
(2x +5)(x - 1) = 0
x = -5/2 atau x = 1
4)
(x+a)(x-3) = x^2+6x - 27
-3a = - 27
a = 9
5.
2(x+1)^2 = 32
(x+1)^2 = 32/2 = 16
x +1 = √16
x+ 1= 4 atau x +1 = - 4
x = 3 atau x = - 5
HP (-5, 3)