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x1+x2=-b/a=-7/1=-7
x1x2=c/a=-8/1=-8
x1+x2
1/x1 + 1/x2
x1+x2 / x1x2
-7/-8
7/8
x1x2
1/x1 . 1/x2
1/x1x2
1/-8
PK baru
x²-(x1+x2)x+x1x2=0
x²-(7/8)x + (-1/8)=0 kalikan 8
8x²-7x-1=0
jawabanya D