[tex] \bold{( - 2x + 5y)( - 2x + 5y)} \\ \bold{(−2x)(−2x)+(−2x)(5y)+(5y)(−2x)+(5y)(5y)} \\ \bold{=4x {}^{2} −10xy−10xy+25y {}^{2} } \\ \dashrightarrow \underline{ \boxed{\bold{=4x {}^{2} −20xy+25y {}^{2} }}}[/tex]
