Simplify: $3 x (4 x - 5) + 3$
And find its value for $x = 3$

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Solution

The correct option is C 66
We have, $3 x (4 x - 5) + 3 = 3 x \times 4 x - 3 x \times 5 + 3$
= $12 x^{2} - 15 x + 3$
When $x = 3$ , then
$3 x (4 x - 5) + 3 = 3 \times 3 (4 \times 3 - 5) + 3$
$= 9 (12 - 5) + 3 = 9 \times 7 + 3$
$= 63 + 3$
$= 66$

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3 x (4 x - 5) + 3

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\frac{1}{2}

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x = \frac{1}{2}

3 x (4 x - 5) + 3

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