If 0 ≤ x ≤ y and (x + y)^2 – (x – y)^2 ≥ 25, what is the least possible value of y?

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If 0 ≤ x ≤ y and (x + y)^2 – (x – y)^2 ≥ 25, what is the least possible value of y?

I’ve done this one before…check it out.