已知(19x-31)(13x-17)-(13x-17)(11x-23)可因式分解成(ax+b)(8x+c),qizhonga,b,c均为整数求a+b-c

问题描述:

已知(19x-31)(13x-17)-(13x-17)(11x-23)可因式分解成(ax+b)(8x+c),qizhonga,b,c均为整数求a+b-c

(19x-31)(13x-17)-(13x-17)(11x-23)
=(13x-17)(19x-31-11x+23)
=(13x-17)(8x-8)
=(ax+b)(8x+c)
所以a=13,b=-17,c=-8
a+b-c=4