Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$x^{4}+9x^{2}+81$$

Factor

$\left(x^{2}-3x+9\right)\left(x^{2}+3x+9\right)$

Evaluate

$x^{4}+9x^{2}+81$

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