Given $3 x - 2 y = 5$ . Find the value of $2 x^{2} - 5 x y (x + y)$ ; when $x = - 5$ .

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Solution

Substituting $x = - 5$ in $3 x - 2 y = 5$ , we get
$- 15 - 2 y = 5$
$=> y = - 10$
Putting values of $x$ and $y$ in , $2 x^{2} - 5 x y (x + y)$ , we get
$2 (25) - 5 (- 5) (- 10) (- 5 - 10) = 50 + 3750 = 3800$

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