exam Maths Puzzle Numerical Ability

y=x+7

y=1/2x

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I don�t get how to do this at all, please help me.
Write these ellipses in standard form and find the center, foci, vertices, and co-vertices.

1. {{{ 25x^2+4y^2+50x-8y-71=0 }} square has sides 3x-2cm. Express the area of the square as a polynomial.