不等式（x+5)(3-2X)大于等于-6的解集是
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(x+5)(3-2x)>=-6
-(x+5)(2x-3)>=-6
(x+5)(2x-3)<=6
2x^2+7x-15-6<=0
2x^2+7x-21<=0
x^2+7x/2-21/2<=0
x^2+7x/2+49/16-49/16-21/2<=0
(x+7/4)^2-217/16<=0
(x+7/4+√217/4)(x+7/4-√217/4)<=0
-7/4-√217/4<=x<=-7/4+√217/4
-(x+5)(2x-3)>=-6
(x+5)(2x-3)<=6
2x^2+7x-15-6<=0
2x^2+7x-21<=0
x^2+7x/2-21/2<=0
x^2+7x/2+49/16-49/16-21/2<=0
(x+7/4)^2-217/16<=0
(x+7/4+√217/4)(x+7/4-√217/4)<=0
-7/4-√217/4<=x<=-7/4+√217/4
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