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: 49

Answer

$\frac{(x-1)^2}{25}-\frac{(y-2)^2}{5}=1$ hyperbola: center $C(1,2)$, foci $F(1\pm\sqrt {30} ,2)$, vertices $V_1(6,2)$, $V_2(-4,2)$ asymptotes: $y=\pm\frac{\sqrt 5}{5}(x-1)+2$ See graph.

Work Step by Step

Step 1. Make squares of the variables: $(x^2-2x+1)-5(y^2-4y+4)=44+1-20$, $(x-1)^2-5(y-2)^2=25$. Divide 25 on both sides to get $\frac{(x-1)^2}{25}-\frac{(y-2)^2}{5}=1$ Step 2. We can identify the conic as a hyperbola centered at $C(1,2)$ Step 3. With $a=5, b=\sqrt 5$, we have $c=\sqrt {25+5}=\sqrt {30}$ and the foci $F(1\pm\sqrt {30} ,2)$ Step 4. The vertices can be found as $V(1\pm5 ,2)$ so that $V_1(6,2)$, $V_2(-4,2)$ Step 5. The original asymptotes are $y=\pm\frac{\sqrt 5}{5}x$ and the new asymptotes are $y=\pm\frac{\sqrt 5}{5}x$. With the shifts given by the new center, we have the new asymptotes as $y-2=\pm\frac{\sqrt 5}{5}(x-1)$ which gives $y=\pm\frac{\sqrt 5}{5}(x-1)+2$ Step 6. See graph.
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