(x+7)(x-3)+4x(x+1)=0
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(x+7)(x-3)+4x(x+1)=0(x+7)(x-3)+4x(x+1)=0(x+7)(x-3)+4x(x+1)=0这方程变型为:x²+4x-21+4x²+4x=0即5x
(x+7)(x-3)+4x(x+1)=0
(x+7)(x-3)+4x(x+1)=0
(x+7)(x-3)+4x(x+1)=0
这方程变型为:
x²+4x-21+4x²+4x=0
即5x²+8x-21=0
根据求根公式得出:
x1=-3 x2=1.4
乘开就是
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