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4x^2+bx+9=0 has no real number solutions what must be true about b​
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4x^2+bx+9=0 has no real number solutions what must be true about b​

User Jaredready
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b^2-4ac<0 b^2-144<0 (b-12)(b+12)<0

-12<b<12

User Hemmer
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