Posted by **anonymous** on Monday, July 11, 2011 at 9:32pm.

solve c(x)=x^2-40x+405

- Math -
**Henry**, Wednesday, July 13, 2011 at 3:57pm
C(x) = x^2 - 40x + 405 = 0,

Use the Quadratic Formula:

x = ( 40 +- sqrt(400-1620)) / 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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