При D>0
D= (-15)²-4*4*b= 225-16b
225-16b>0
16b<225
b<225/16 или b<14,0625
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При D>0
D= (-15)²-4*4*b= 225-16b
225-16b>0
16b<225
b<225/16 или b<14,0625