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d²-7d-8

y²+2y-8²

d²-7d-8=d²+d-8d-8=d(d+1)-8(d+1)=(d+1)(d-8)y²+2y-8²=y²+2y-64=y²+2y+1-65=(y+1)²-65=(y+1)²-(√65)²=(y+1+√65)(y+1-√65)