<PRE><B>Question 939556</B>
Find an integer c such that the equation 4x^2+cx+9=0 has a double real root. 
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Condition required to have double real root:: b^2-4ac = 0
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Solve:: c^2 -4*4*9 = 0
c^2 -144 = 0
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(c-12)(c+12) = 0
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c = 12 or c = -12
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Cheers,
Stan H.
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