Question

a, (3x-1)^2+2(x+3)^2+11(x-1)(1-x) b, (x-2)(x^2+2x+4)-(x-1)^3+7 Có ai làm đc chx ạ chỉ e với ạ e cần gấp

Answer 1

`a)(3x-1)^2+2(x+3)^2+11(x-1)(1-x)`

`=9x^2-6x+1+2(x^2+6x+9)-11(x^2-1)`

`=9x^2-6x+1+2x^2+12x+18-11x^2+11`

`=6x+30`

`b)(x-2)(x^2+2x+4)-(x-1)^3+7`

`=x^3-8-x^3+3x^2-3x+1+7`

`=3x^2-3x`

Answer 2

`a)`\(\left(3x-1\right)^2+2\left(x+3\right)^2+11\left(x-1\right)\left(1-x\right)\)

\(=9x^2-6x+1+2x^2+12x+18-11\left(x-1\right)^2\)

\(=9x^2-6x+1+2x^2+12x+18-11x^2+22x-11\)

\(=28x+8\)

`b)`\(\left(x-2\right)\left(x^2+2x+4\right)-\left(x-1\right)^3+7\)

\(=x^3-8-x^3+3x^2-3x+1+7\)

\(=3x^2-3x\)