解不等式:14-4x^2≥xxiexie

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解不等式:14-4x^2≥xxiexie解不等式:14-4x^2≥xxiexie解不等式:14-4x^2≥xxiexie对14-4x^2≥x整理,4x^2+x-14≤0,函数y=4x^2+x-14的两

解不等式:14-4x^2≥xxiexie
解不等式:14-4x^2≥x
xiexie

解不等式:14-4x^2≥xxiexie
对14-4x^2≥x整理,
4x^2+x-14≤0,
函数y=4x^2+x-14的两根为x1=7/4,x2=-2
所以14-4x^2≥x的解集:
-2≤x≤7/4

4x^2+x-14<=0
(x+2)(4x-4)<=0
-2<=x<=4/7