Back to number 1. Note that this equation has two solutions - one with a positive square root, and one with a negative square root. The square root of a negative number is not a real number.
We just need to find the x values that correspond. Note that when we take the square root, we get two possible values for x. What then do you wish to have to do with that expression? You ought to reword your query when you consider that the only factor i can assume you possibly can wish to do is multiply the 5ab for the duration of and then simplify.
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