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(a+b)(a-b) Expansion and Visualisation

Factorize: x...

Question

Factorize:
$x^{2} - 21 x + 108$

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Solution

$x^{2} - 21 x + 108 = x^{2} - 12 x - 8 x + 108 = x (x - 12) - 8 (x - 12) = (x - 8) (x - 12)$

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