Question 1023458
{{{x^2/a^2 + y^2/b^2 = 1}}} is the standard form.

Here, a = 16/2 = 8, and c = 10/2 = 5.

Now {{{a^2 = b^2 + c^2}}} for the ellipse, and so {{{64 = b^2 + 25}}}

==> {{{b = sqrt(39)}}}

Hence {{{x^2/64 + y^2/39 = 1}}} is the standard form for this ellipse.

Now it would be a simple matter to transform this equation to its general form.