exam Maths Puzzle Numerical Ability

(4x + 5)^2

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exam Other Question

Find the exact solution(s) of the system (x^2/4) - y^2 = 1 and x = y^2 + 1.

Thanks the problem is 1/2-5/8x=7/8x+7/2
do I use the reciprocal method to get rid of 7/8 to get x by itself?