a) x^2 + 2x + 1
=\(x^2+2.x.1+1^2\)
\(=\left(x+1\right)^2\)
b) x^2 + 6x + 9
=\(x^2+2.x.3+3^2\)
\(=\left(x+3\right)^2\)
c) x^2 - 6x + 9
\(=x^2-2.x.3+3^2\)
=\(\left(x-3\right)^2\)
d) x^2 - 2x + 1
\(=x^2-2.x.1+1^2\)
\(=\left(x-1\right)^2\)
e ) 4x^2 + 4xy +y^2
\(=\left(2x\right)^2+2.2x.y+y^2\)
\(=\left(2x+y\right)^2\)
f) x^2 + 4xy + 4y^2
\(=x^2+2.x.2y+\left(2y\right)^2\)
\(=\left(x+2y\right)^2\)
phân tích các đa thức sau thành nhân tử
a) x^2 + 2x + 1
\(=\left(x+1\right)^2\)
b) x^2 + 6x + 9
\(=\left(x+3\right)^2\)
c) x^2 - 6x + 9
\(=\left(x-3\right)^2\)
d) x^2 - 2x + 1
\(=\left(x-1\right)^2\)
e ) 4x^2 + 4xy +y^2
\(=\left(2x\right)^2+4xy+y^2\)
\(=\left(2x+y\right)^2\)
f) x^2 + 4xy + 4y^2
\(=x^2+4xy+\left(2y\right)^2\)
\(=\left(x+2y\right)^2\)
p/s: --.--
