Question

Rút gọn 

a)x(2x^2-3)-x^2(5x+1)+x^2

b)3x (x-2)-5x(1-x)-8(x^2-3)

Sos 

Answer 1

a) \(x\left(2x^2-3\right)-x^2\left(5x+1\right)+x^2\)

\(=2x^3-3x-5x^3-x^2+x^2\\ =-3x^3-3x\)

b) \(3x\left(x-2\right)-5x\left(1-x\right)-8\left(x^2-3\right)\)

\(=3x^2-6x-5x+5x^2-8x^2+24\\ =-11x+24\)

Answer 2

`a, = 2x^3 - 3x - 5x^3 - 5x^2 + x^2`

`= -3x^3 - 4x^2 - 3x`

`b, = 3x^2 - 6x - 5x + 5x^2 - 8x^2 + 24`

`= -11x + 24`