x^2-y^2+4x+6y-5

问题描述:

x^2-y^2+4x+6y-5
RT.
因式分解QAQ

x^2-y^2+4x+6y-5
=x²+4x+4-(y²-6y+9)
=(x+2)²-(y-3)²
=(x+2+y-3)(x+2-y+3)
=(x+y-1)(x-y+5)