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(a-b)^2 Expansion and Visualisation

a4-81b4.

Question

$a^{4} - 81 b^{4}$ .

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Solution

$a^{4} - 81 b^{4}$
$(a^{2} + 9 b^{2}) (a^{2} - 9 b^{2})$
$(a^{2} + 9 b^{2}) (a + 3 b) (a - 3 b)$

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