\(\left(x^2+1\right)^2-6\left(x^2+1\right)+9\)
\(=\left[\left(x^2+1\right)-3\right]^2\)
\(=\left(x^2+1-3\right)^2\)
\(=\left(x^2-2\right)^2\)
Trả lời:
( x2 + 1 ) - 6 ( x2 + 1 ) + 9
= ( x2 + 1 ) - 2.( x2 + 1 ).3 + 32
= [ ( x2 + 1 ) - 3 ) ]2
= ( x2 + 1 - 3 )2
= ( x2 - 2 )2