## College Algebra 7th Edition

$i=-100\pm 100\sqrt{\frac{A}{P}}$
$A=P(1+\displaystyle \frac{i}{100})^{2}$ Divide by P: $\frac{A}{P}=(1+\frac{i}{100})^{2}$ Square root both sides: $\pm\sqrt{\frac{A}{P}}=1+\frac{i}{100}$ Subtract 1: $-1\pm\sqrt{\frac{A}{P}}=\frac{i}{100}$ Solve for $i$: $i=-100\pm 100\sqrt{\frac{A}{P}}$