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(x - 3)(x + 5) = 0
x = 3 \/ x = -5
jadi akar dari x² + 2x - 15 = 0 adalah 3 atau -5
= x ( x + 5 ) - 5 ( x + 5 )
= ( x + 5 ) ( x - 5)
x + 5 = 0 atau x - 5 =0
x = -5 x = 5
Hs { -5,5 }
maaf klau salah