b: \(5x^2+6xy+y^2\)
\(=5x^2+5xy+xy+y^2\)
\(=5x\left(x+y\right)+y\left(x+y\right)\)
\(=\left(x+y\right)\left(5x+y\right)\)
c: \(x^2-7x+10=\left(x-2\right)\left(x-5\right)\)
d: \(4x^2+12x+9-y^2\)
\(=\left(2x+3\right)^2-y^2\)
\(=\left(2x-y+3\right)\left(2x+y+3\right)\)