\(4x^2-y^2+10y-25\)
\(=4x^2-\left(y^2-10y+25\right)\)
\(=\left(2x\right)^2-\left(y-5\right)^2\)
\(=\left(2x+y-5\right)\left(2x-y+5\right)\)
\(4x^2-y^2+10y-25=4x^2-\left(y^2-10y+25\right)\)
\(=\left(2x\right)^2-\left(y-5\right)^2\)
\(=\left(2x+y-5\right)\left(2x-y+5\right)\)
Chắc vậy !!! Hok tốt ~