- #1

Government$

- 87

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## Homework Statement

Find equation of elips if b=3 and point M(-2SQRT(5), 2) is on elipse.

## Homework Equations

x^2/a^2 + y^2/b^2 = 1

## The Attempt at a Solution

x^2/a^2 + y^2/b^2 = 1

20/a^2 + 4/9 = 1

20/a^2 + 4/9 = 1 / * a^2

20 + 4a^2/9 = a^2

20 + 4^2 = 9a^2

20= 5a^2

a = 2

so equation of elipse is x^2/4 + y^2/9 = 1

But answer at the end of a book is 9x^2 + 36y^2 = 324

Which one is correct?