Factorise $: 121 x^{2}-289 y^{2}$
Factorise $: 121 x^{2}-289 y^{2}$
$121 x^{2}-289 y^{2}=(11 x)^{2}-(17 y)^{2}$
$=(11 x-17 y)(11 x+17 y)$
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