exam Maths Puzzle Numerical Ability

I am stuck on correct answer for:

what are all possible values of x such that x^2 = 5x

I am not using a specific book. I am just practicing...

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exam Other Question

How does one prove: If C is an infinite set and B is a finite set, the CB is an infinite set? I can do the proof if B = null set, but I get lost if B intersects C. If B has n e find an equation of the line that passes through the point (4,5) and has slope -2.