Homework Help: math

Posted by Shirley on Saturday, February 23, 2008 at 2:35pm.

The equation P=240I-8I^2 represents the power, P, (in watts) of a 240 volt circuit with a resistance of 8 ohms when a current of I amperes is passing through the circuit.

(a)Find the maximum power (in watts)that can be delivered in this circuit.
(Find the current (in amperes) needed to develop this maximum power.

I have trouble to find the maximum power,please help! THANKS A LOT!

math - Reiny, Saturday, February 23, 2008 at 5:27pm
If you are studying Calculus, find the derivative of your function, set it equal to zero and solve for I

If not, complete the square and get the result that way.

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