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April 1, 2015

April 1, 2015

Posted by **KK** on Saturday, July 27, 2013 at 12:56pm.

- Maths -
**Steve**, Saturday, July 27, 2013 at 3:34pmdf/dx = 2x+18

dg/dx = (2f+18)(2x+18)

df/dx=0 when x = -9

dg/dx=0 when f = -9 or x = -9

f = -9 means

x^2+18x+a = -9

x = -9±√(72-a)

So, a <= 72

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