Posted by Dippy on Wednesday, March 4, 2009 at 2:26am.
I gave you the answer yesterday. I picked 2.56 because
4x^2 + 6.4x + 2.56 = (2x + 1.6)^2
is a "perfect square", as you can verify by multiplication.
1.6 is the number which, when multiplied by twice the square root of 4 (the first coefficient) gives the second coefficient, 6.4.
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