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  4. The maximum possible value of x2+y2-4 x-6 y, where x, y ∈ R, subject to the condition |x+y|+|x-y|=4, is equal to

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Q. The maximum possible value of $x^2+y^2-4 x-6 y$, where $x, y \in R$, subject to the condition $|x+y|+|x-y|=4$, is equal to

Relations and Functions - Part 2

Solution:

$E_{\max }(x=-2, y=-2)=28$