exam Maths Puzzle Numerical Ability

I have a problem that is stumping me. I would appreciate your help very much! The problem is:
2x^2-5x+2=0
Thank you for your help!!1

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exam Other Question

Solve the formula for the given variable. Assume all variables represent nonnegative numbers.

A=5s^2, for s.
I need to see how to solve the following problem:
-3(8 - c)= 7c