book Maths Puzzle Numerical Ability

Either perform the indicated operation or solve the equation, whichever is appropriate.

x^2-4/x = 4x-8/x

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book Other Question

how many real solutions does a quadratic equation have when the discriminant is negative,positive,and zero? I have a rectangle with sides 1, 1 and square root of 2. I need to find the angle between a diagonal and one of the long edges. I tried using trigonometry but making different kind