Given $f (x, y) = 80 x + 50 y - 5 x^{2} - 4 y^{2} - x y$
Evaluate $f (1, 9)$
$f (1, 9) =$

Answer

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Answer

Final Answer: $192$

Steps

Step 1 ：Given the function $f (x, y) = 80 x + 50 y - 5 x^{2} - 4 y^{2} - x y$

Step 2 ：We need to evaluate $f (1, 9)$

Step 3 ：Substitute $x = 1$ and $y = 9$ into the function

Step 4 ：After simplifying the expression, we get $f (1, 9) = 192$

Step 5 ：Final Answer: $192$