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x²+2x-3=0
(x-1)(x+3)=0
x-1=0 atau x+3=0
x=1 x=-3
3.6x²+8x+2=0
x=-b√b²-4ac+
2a
=-8+√16
12
= -8+4
12
= -8+4 atau -8-4
12 12
= -1/3 =-1