因式分解4x^2-5x-3如题
问题描述：
因式分解4x^2-5x-3
如题
答
原式=4x^2-5x+(5/4)^2-3-(5/4)^2=(2x-5/4)^2-73/16
=(2x-5/4+1/2*√7)(2x-5/4-1/2*√73)
=(2x+(2√73-5)/4)(2x-(5+2√73)/4)
答
(2x+1)(2x-3)
答
4x^2-5x-3
=(x-(5+√73)/8)(x-(5-√73)/8)
答
=[x+(5+√73)/8][x-(5-√73)/8]