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oh sorry the parabola is y=5-x^2

oh. inscribed in, so i had it wrong... so you don't have any constraint in this problem...?

I think the range of parabola is the constraint, just get the concept first!

A = 2x ( 5 - x²)
= -2x³ + 10x
->A' = -6x² + 10 = 0 => x = √ 5/3