2m^2-mn-n^2因式分解

问题描述:

2m^2-mn-n^2因式分解
x^2+2x-15

2m^2-mn-n^2
=(m^2-n^2)+(m^2-mn)
=(m+n)(m-n)+m(m-n)
=(m-n)(m+n+m)
=(m-n)(2m+n)x^2+2x-15谢谢x^2+2x-15=(x+5)(x-3)