(1) 14-4X^2 ≥X
问题描述:
(1) 14-4X^2 ≥X
(2) X(X+2)
答
(1) 14-4X^2 ≥X
4x^2+x-14≤0
(x+2)(4x-7)≤0
-2≤x≤7/4
(2) X(X+2)
(3) (5-X)(X+4)-4