Question

2x＾3+3x＾2-1=0帮忙写下步骤

Answer 1

2x^3+3x^2-1

=2X^3+2X^2+X^2-1

=2X^2(X+1)+(X+1)(X-1)

=(X+1)(2X^2+X-1)

=(X+1)(2X-1)(X+1)=0

所以x+1=0 X=-1

2X-1=0 X=1/2

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