1.

Write the first three terms of the sequence an = (-1)n-1 5n+1

Answer»

y2/4 - x2/9 = 1

⇒ a2 = 4, b2 = 9

⇒ a = 4, b = 3

c = √(a2 + b2) = √(4 + 9) = √13

The eccentricity e = c/a = √13/2



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