Question 1062630
This is an ellipse
The general form is:
{{{ x^2 /a^2 + y^2 / b^2 = 1 }}}
Multiply both sides by {{{ a^2*b^2 }}}
{{{ b^2*x^2 + a^2*y^2 = a^2*b^2 }}}
{{{ 3^2*x^2 + 5^2*y^2 = 5^2*3^2 }}}
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So, in your equation,
{{{ b^2 = 9 }}}
{{{ b = 3 }}}
{{{ b = -3 }}}
and
{{{ a^2 = 25 }}}
{{{ a = 5 }}}
{{{ a = -5 }}}
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The domain is from {{{ x = -a }}} to {{{ x = a }}}, which is 
{{{x =  -5 }}} to {{{ x = 5 }}}
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The range is from {{{ x = -b }}} to {{{ x = b }}}, which is
{{{ y = -3 }}} to {{{ y = 3 }}}
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Hope this helps