zapisz w postaci sumy algebraicznej
a) (x+1)(x+2)(x+3)
b) (x-2)(x+5)(2x-1)
a) (x+1)(x+2)(x+3)=(x^2+2x+x+2)(x+3)=(x^2+3x+2)(x+3)=x^3+3x^2+3x^2+9x+2x+6=
x^3+6x^2+11x+6
b)(x-2)(x+5)(2x-1)=(x^2+5x-2x-10)(2x-1)=(x^2+3x-10)(2x-1)=2x^3+6x^2-20x-x^2-3x-10=2x^3+5x^2-23x+10
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a) (x+1)(x+2)(x+3)=(x^2+2x+x+2)(x+3)=(x^2+3x+2)(x+3)=x^3+3x^2+3x^2+9x+2x+6=
x^3+6x^2+11x+6
b)(x-2)(x+5)(2x-1)=(x^2+5x-2x-10)(2x-1)=(x^2+3x-10)(2x-1)=2x^3+6x^2-20x-x^2-3x-10=2x^3+5x^2-23x+10