Factorisation of the expression : $7 a^{2} - 49 b^{2}$

7 (a^{2} - 7 b^{2})

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7 a^{2} - 7 b^{2}

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7 (a^{2} - b^{2})

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7 (7 a^{2} - b^{2})

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Solution

The correct option is A $7 (a^{2} - 7 b^{2})$
$7 a^{2} - 49 b^{2} = (7 \times a \times a) - (7 \times 7 \times b \times b)$

$= 7 (a^{2} - 7 b^{2})$

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