Question

A= \(x^3\)+12\(x^2\)+48x+64 tại x=6

Answer 1

\(=>A=x^3+3.4x^2+3.4^2x+4^3=\left(x+4\right)^3\)

tại x=6 \(=>A=\left(6+4\right)^3=10^3=1000\)

Answer 2

Answer 3

Ta có: \(A=x^3+12x^2+48x+64\)

\(=x^3+3\cdot x^2\cdot4+3\cdot x\cdot4^2+4^3\)

\(=\left(x+4\right)^3\)

\(=\left(6+4\right)^3=10^3=1000\)