(3х+1)(3х-1)-(х+2)(х-1)=8
9x²-1-(x²-x+2x-2)=8
9x²-1-x²+x-2x+2-8=0
8x²-x-7=0
D=1+4*7*8=225
x=(1-15)/16=-14/16=-7/8
x=(1+15)/16=1
ответ: -7/8, 1
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(3х+1)(3х-1)-(х+2)(х-1)=8
9x²-1-(x²-x+2x-2)=8
9x²-1-x²+x-2x+2-8=0
8x²-x-7=0
D=1+4*7*8=225
x=(1-15)/16=-14/16=-7/8
x=(1+15)/16=1
ответ: -7/8, 1