Решите неравенство с рисунком -5x^2+45>0
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-5x^2+45>0 /:5
-x^2+9>0
x^2-9<0
(x-3)(x+3)<0
-3<x<3
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Verified answer
-5x^2+45>0 /:5
-x^2+9>0
x^2-9<0
(x-3)(x+3)<0
-3<x<3