(x-1)(x²+2x-3)=

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(x-1)(x²+2x-3)=
(x-1)(x²+2x-3)=

(x-1)(x²+2x-3)=
解
(x-1)(x²+2x-3)
=x(x²+2x-3)-(x²+2x-3)
=x³+(2x²-x²)+(-3x-2x)+3
=x³+x²-5x+3

=x(x²+2x-3)-1(x²+2x-3)
=x³+2x²-3x-x²-2x+3
=x³+x²-5x+3