Factorise :
$121 a c - 16 a^{2} b^{2}$

a (121 c - 16 a b^{2})

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a (121 c + 16 a b^{2})

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a (121 c - 16 a c^{2})

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none of these

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Solution

The correct option is A $a (121 c - 16 a b^{2})$
$121 a c - 16 a^{2} b^{2}$
$= 121 \times a \times c - 16 \times a \times a \times b \times b$
$= a (121 c - 16 a b^{2})$

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