Factorise:

Question:

Factorise:
81 − 49x2

Solution:

We have:

$81-49 x^{2}=(9)^{2}-(7 x)^{2}$

$=(9+7 x)(9-7 x)$

$\therefore 81-49 x^{2}=(9+7 x)(9-7 x)$

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