Question

Phân tích đa thức sau thành nhân tử x^2-25+y^2+2xy

Answer 1

\(x^2-25+y^2+2xy\)

\(=\left(x^2+2xy+y^2\right)-25\)

\(=\left(x+y\right)^2-5^2\)

\(=\left(x+y-5\right)\left(x+y+5\right)\)

Answer 2

\(x^2-25+y^2+2xy=\left(x+2\right)^2-25=\left(x+2-25\right)\left(x+2+25\right)\)

\(=\left(x-23\right)\left(x+27\right)\)

Hok tốt

Answer 3

Ưm mình nhầm 

\(x^2-25+y^2+2xy=\left(x+y\right)^2-25=\left(x+y-5\right)\left(x+y+5\right)\)

Hok tốt !