book Maths Puzzle Numerical Ability

find factors of 20y^4x+12yx^2+4y^2x^2-8xy

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book Other Question

6/x + x/2 = 4
What is x? Write an equation of the circle whose center is at the origin and the point (3,-6) is on the circle.

I know the the formula to use is this:

(x-h)squared + (y-k)squared = r squared