Hi guys...need your help again.

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Originally Posted by Alienis Back Hi guys...need your help again. isn't $\displaystyle r$ the rate of interest? just plug in $\displaystyle r = 0.12$ (the decimal equivalent of 12%) and calculate

Now how do I factor the right side? Just give me a clue.

Originally Posted by Alienis Back Now how do I factor the right side? Just give me a clue. it should be $\displaystyle 1 + r + \frac {r^2}4$ in the brackets, right? if so, first factor out the 1/4, you get $\displaystyle \frac 14 (4 + 4r + r^2) = \frac 14(r^2 + 4r + 4)$ now, can you factor the inside? you should be able to