解不等式2x^2+(5+2a)x+5a

问题描述:

解不等式2x^2+(5+2a)x+5a

(2x+5a)(x+1)若a>2/5
则解为-5a/2若a则解为-1

(2x+5)(x+a)当a x>-a或x当a>5/2时
x-5/2
当a=-5/2时
(2x+5)^2 X无实解

2x^2+(5+2a)x+5a
=(x+1)(2x+5a)