(3х+1)(3х-1)-(х+2)(х-2)=8
9x²-1-(x²-4)=8
9x²-1-x²+4=8
8x²=5
x²=5/8
x=±√5/√8
ответ: ±√5/√8
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(3х+1)(3х-1)-(х+2)(х-2)=8
9x²-1-(x²-4)=8
9x²-1-x²+4=8
8x²=5
x²=5/8
x=±√5/√8
ответ: ±√5/√8