x 3 1 -5 0 x -1 1 1 =0 x=?
问题描述:
x 3 1 -5 0 x -1 1 1 =0 x=?
答
x 3 1
-5 0 x
-1 1 1
=- x^2 - 3x + 10
= -(x + 5)(x - 2).
所以 x = -5或 x = 2.