$E v a l u a t e : 4 x - {3 y}^{2} - 5 x y, f o r x = - 1 a n d y = 3.$

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Solution

$4 x - 3 y^{2} - 5 x y$ at $x = - 1$ and $y = 3$
$= 4 \times - 1 - 3 \times 3^{2} - 5 \times - 1 \times 3$
$= - 4 - 27 + 15$
$= - 31 + 15 = - 16$

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