Question

x^2-25+y^2+2xy

Answer 1

=(x+y)^2-25

=(x+y+5)(x+y-5)

Answer 2

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

Answer 3

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