Ответ:
(3x-1)(3x+1)-(x-1)(x+2)=8
9x²-1-x²-2x+x+2=8
9x²-x²-x=8-2+1
8x²-x=9
8x²-x-9=0
8x²+8x-9x-9=0
8x(x+1)-9(x+1)=0
(x+1)(8x-9)=0
x+1=0
x=-1
8x-9=0
x=9/8
x=1,125
x1=-1
x2=1,125
-1+1,125=0,125
Ответ: 0,125
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Answers & Comments
Ответ:
(3x-1)(3x+1)-(x-1)(x+2)=8
9x²-1-x²-2x+x+2=8
9x²-x²-x=8-2+1
8x²-x=9
8x²-x-9=0
8x²+8x-9x-9=0
8x(x+1)-9(x+1)=0
(x+1)(8x-9)=0
x+1=0
x=-1
8x-9=0
x=9/8
x=1,125
x1=-1
x2=1,125
-1+1,125=0,125
Ответ: 0,125