Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 11 - Section 11.4 - Shifted Conics - 11.4 Exercises - Page 815: 53

Answer

$\frac{y^2}{16}-\frac{(x-3)^2}{9}=1$ center $C(3,0)$, foci $F(3,\pm5)$, vertices $V(3,\pm4)$ asymptotes: $y=\pm\frac{4}{3}(x-3)$ See graph.

Work Step by Step

Step 1. Form square with variables: $16(x^2-6x+9)-9y^2=144-288$ or $16(x-3)^2-9y^2=-144$. Divide both sides by $-144$, we get $\frac{y^2}{16}-\frac{(x-3)^2}{9}=1$ Step 2. The above equation shows a hyperbola with a center at $C(3,0)$ Step 3. With $a=4, b=3$, we have $c=\sqrt {16+9}=5$ and the foci are $F(3,\pm5)$ Step 4. The vertices are at $V(3,\pm4)$ Step 5. The original asymptotes are $y=\pm\frac{4}{3}x$, with the center shifted to $(3,0)$, the new asymptotes are $y=\pm\frac{4}{3}(x-3)$ Step 6. See graph.
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