We have: nbsp; nbsp; nbsp; nbsp;81 49x2=92 7x2 #160; #160; #160; #160; #160; #160; #160; #160; #160; #160; #160; #160; #16 ...

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Factorisation by Common Factors

Factorise:81-...

Question

Factorise:
81 − 49x²

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Solution

We have:
$81 - 49 x^{2} = {(9)}^{2} - {(7 x)}^{2} = (9 + 7 x) (9 - 7 x)$

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

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