If $x = 3$ , then find the value of the expression $2 x^{2} - 3 x - 4$ .

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Solution

Given $x = 3$

$2 x^{2} - 3 x - 4$

$= 2 {(3)}^{2} - 3 \times 3 - 4$

$= 2 \times 9 - 9 - 4$

$= 18 - 9 - 4$

$= 5$

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