Question

Tính:

A. x³+12x²+48x+64

B. x³ - 6x²+ 12x -8

C. (2x+y²)³

D. (x+2y+z) (x+2y-z)

E. (2x-1) (4x²+2x + 1)

Answer 1

\(A=x^3+12x^2+48x+64=\left(x+4\right)^3\)

\(B=x^3-6x^2+12x-8=\left(x-2\right)^3\)

\(D=\left(x+2y+z\right)\left(x+2y-z\right)=\left(x+2y\right)^2-\left(z\right)^2\)

\(E=\left(2x-1\right)\left(4x^2+2x+1\right)=8x^3-1\)

Answer 2

\(C=\left(2x+y^2\right)^3=\left(2x\right)^2+3\left(2x\right)^2y^2+3.2x\left(y^2\right)^3+\left(y^2\right)^3\)