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