Question

Câu 7b ai biết ko ạ

Answer 1

 7b. \(k\left(x\right)=2x\left(4x+1\right)-8x^2\left(x+1\right)+\left(2x\right)^3-2x+3\)

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

\(k\left(x\right)=3\)

Vậy: Ta có đpcm

Answer 2

Bài 7:

b: Ta có: \(K\left(x\right)=2x\left(4x+1\right)-8x^2\left(x+1\right)+\left(2x\right)^3-2x+3\)

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

=3