Posted by **Anonymous** on Sunday, October 25, 2009 at 9:27pm.

A generator produces electrical power, P, in watts, according to the function P(R)=(120R)/(0.4+R)^2,

where R is the resistance, in ohms. Determine the intervals on which the power is increasing.

- advanced functions -
**bobpursley**, Sunday, October 25, 2009 at 9:31pm
I would take the first derivative, and make it >0 and solve for the intervals.

- advanced functions -
**michael**, Monday, October 26, 2009 at 12:43am
1. P&prime&prime(R)=0

->gives you the points at which the slope of P(R) changes from increasing to decreasing or vice versa.

2. Plug in a number between the intervals back into P&prime&prime(R)

-> for example if you found:

R= -1 and R = 4

plug in 0 or 1 or 2 or 3 into P&prime&prime if its positive then the slopes are increasing on the interval from (-1, 4)

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