Question

I : PTĐTTNT

A= \(\left(x^2-6x\right)^2-2\left(x-3\right)^2-81\)

B=\(x^4+y^4+z^4-2x^2y^2-2y^2z^2-2x^2z^2\)

help me !!!

Answer 1

\(\left(x^2-6x\right)^2-2\left(x-3\right)^2-81=\left[\left(x^2-6x\right)^2-81\right]-2\left(x-3\right)^2=\left[\left(x^2-6x\right)^2-9^2\right]-2\left(x-3\right)^2=\left(x^2-6x+9\right)\left(x^2-6x-9\right)-2\left(x-3\right)^2=\left(x-3\right)^2\left(x^2-6x-9\right)-2\left(x-3\right)^2=\left(x-3\right)^2\left(x^2-6x+11\right)\)

Answer 2

=\(\left(x-3\right)^2\left(x^2-6x-11\right)\)

nha