prove that 9x² +30x+28 has no zero
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has no real root
b^2-4ac<0
30^2-4*28*9<0
900-1008<0
-108<0
b^2-4ac<0
30^2-4*28*9<0
900-1008<0
-108<0
shuchi3:
not bad keep it up
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