College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 7, Conic Sections - Section 7.3 - Hyperbolas - 7.3 Exercises - Page 572: 37

Answer

The equation for the hyperbola specified in this problem is: $\frac{x^{2}}{9} - \frac{y^{2}}{16} = 1$

Work Step by Step

From the vertices of $(3, 0)$ and $(-3, 0)$, we already have the $a$ term for the equation. We can now plug in $3$ into the standard equation for a hyperbola to get: $\frac{x^{2}}{3^{2}} - \frac{y^{2}}{b^{2}} = 1$ To find the value for $b$, we use the equation: $a^{2} + b^{2} = c^{2}$ We already have the value for $a$, which is $3$, and the value for $c$, which is $5$. We plug these into the equation above to get: $(3)^{2} + b^{2} = (5)^{2}$ We simplify this equation to get: $9 + b^{2} = 25$ To isolate $b$, we subtract $9$ from both sides: $b^{2} = 16$ Take the square root of both sides to get: $b = ±4$ Now, we plug both $a$ and $b$ back into the standard equation for hyperbolas to get: $\frac{x^{2}}{3^{2}} - \frac{y^{2}}{4^{2}} = 1$ We simplify this equation to get: $\frac{x^{2}}{9} - \frac{y^{2}}{16} = 1$
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