Posted by anonymous on Monday, July 11, 2011 at 9:32pm.
solve c(x)=x^240x+405

Math  Henry, Wednesday, July 13, 2011 at 3:57pm
C(x) = x^2  40x + 405 = 0,
Use the Quadratic Formula:
x = ( 40 + sqrt(4001620)) / 2,
x = (40 + sqrt(20)) / 2,
x = (40 + sqrt(20*1)) / 2,
x = (40 + 4.47i) / 2,
Solution Set:
x = 20 + 2.24i.
x = 20  2.24i.

Math  Henry, Wednesday, July 13, 2011 at 4:08pm
Correction:Replace 400 with 1600.
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