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If x+y=15, show that x^(2)+y^(2) is leas...

If `x+y=15`, show that `x^(2)+y^(2)` is least , when `x=y=(15)/(2)`.

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CHHAYA PUBLICATION-MAXIMA AND MINIMA -EXERCISE Very Short Answer Type Questions
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  20. If x+y=15, show that x^(2)+y^(2) is least , when x=y=(15)/(2).

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