Rút gọn: (x^2-7)(x+2)-(2x-1)(x-14)+x(x^2-2x-22) 11/08/2021 Bởi Kaylee Rút gọn: (x^2-7)(x+2)-(2x-1)(x-14)+x(x^2-2x-22)
(x^2-7)(x+2)-(2x-1)(x-14)+x(x^2-2x-22) = x^3+2x^2-7x-14-(2x^2-28x-x+14)+x^3-2x^2-22x = x^3-7x-14-2x^2+29x-14+x^3-22x =2x^3-2x^2-28 Bình luận
`(x^2-7)(x+2)-(2x-1)(x-14)+x(x^2-2x-22)` `=x^3+2x^2-7x-14-(2x^2-29x+14)+x^3-2x^2-22x` `=x^3+2x^2-7x-14-2x^2+29x-14+x^3-2x^2-22x` `=2x^3-2x^2-28` Bình luận
(x^2-7)(x+2)-(2x-1)(x-14)+x(x^2-2x-22)
= x^3+2x^2-7x-14-(2x^2-28x-x+14)+x^3-2x^2-22x
= x^3-7x-14-2x^2+29x-14+x^3-22x
=2x^3-2x^2-28
`(x^2-7)(x+2)-(2x-1)(x-14)+x(x^2-2x-22)`
`=x^3+2x^2-7x-14-(2x^2-29x+14)+x^3-2x^2-22x`
`=x^3+2x^2-7x-14-2x^2+29x-14+x^3-2x^2-22x`
`=2x^3-2x^2-28`