Find $3 y (2 y - 7) - 3 (y - 4) - 63$ if $(y = 2)$

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Solution

Let $f (y) = 3 y (2 y - 7) - 3 (y - 4) - 63$
Therefore,
$f (y = 2) = (3 \times 2) (2 \times 2 - 7) - 3 (2 - 4) - 63$
$\Rightarrow f (y = 2) = 6 (- 3) - 3 (- 2) - 63$
$\Rightarrow f (y = 2) = - 18 + 6 - 63 = - 75$

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