- #1
Government$
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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?