Simplify the expression and find its value, when $x = - 1$ and $y = 2$ .
${2 x}^{2} - 3 y + {3 x}^{2} + {5 x}^{2} + 5 x - 7 - 7 x + 2 y$

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Solution

According to question,

$2 x^{2} - 3 y + 3 x^{2} + 5 x^{2} + 5 x - 7 - 7 x + 2 y$

$= 10 x^{2} - 2 x - y - 7$
At $x = - 1$ and $y = 2$ ,

$10 (- 1)^{2} - 2 (- 1) - 2 - 7$

$=$ $10 + 2 - 2 - 7$

$= 3$

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