Chapter 8 - Complex Numbers, Polar Equations, and Parametric Equations - Section 8.3 The Product and Quotient Theorems - 8.3 Exercises - Page 376: 36

$[24.3cis(\frac{7\pi}{12})]^2$ = $-511.3793 - 295.2450i$

$[24.3cis(\frac{7\pi}{12})]^2$ = $24.3^2 cis(\frac{7\pi}{12}) cis(\frac{7\pi}{12})$ = $24.3^2 cis(\frac{7\pi}{12} + \frac{7\pi}{12})$ (Product Theorem) = $24.3^2 cis(\frac{7\pi}{6})$ = $-511.3793 - 295.2450i$ (Using calculator and corr. to 4 decimal places)