Multiply $(6 x - 7)$ and $(6 x + 7)$

36 x^{2} + 42 x + 49

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36 x^{2} - 42 x + 49

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6 x^{2} - 49

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36 x^{2} - 49

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Solution

The correct option is C $36 x^{2} - 49$
$(6 x - 7) (6 x + 7)$
Using,
$(a + b) (a - b) = a^{2} - b^{2}$
$= (6 x)^{2} - 7^{2}$
$= 36 x^{2} - 49$

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