If $x = 2$ , find the value of
$3 x^{2} - 2 x - 7$

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Solution

Let us substitute $x = 2$ in the given expression $3 x^{2} - 2 x - 7$ as shown below:

$3 x^{2} - 2 x - 7 = (3 \times 2^{2}) - (2 \times 2) - 7 = (3 \times 4) - 4 - 7 = 12 - 11 = 1$

Hence, $3 x^{2} - 2 x - 7 = 1$ if $x = 2$ .

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