math
posted by Shirley .
The equation P=240I8I^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!

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.