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akar(x+y = a
akar(x-y = b
pers. 1. a2+3a-18=0
(a+6)(a-3)=0, a=-6 / 3
pers. 2. b2-2b-15=0
(b-5)(b+3)=0, b=-3 / 5
karena nilai akar harus postive jadi yg hasilnya negativ tidak memenuhi
jadi
x+y = 9
x-y = 25
x=17, y=-8
x.y = -136