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 any specific book. I am just practicing..

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exam Other Question

I have hourglass figure. Total h=10. Upper cone radius=3. Lower cone radius=5 Find Volume Perform the indicated division. Rationalize the denominator if necessary. Then simplify each radical expression.

6 - sqrt(20) divided by 2