Example

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

Question

$$\sqrt{9+4\sqrt{5}}-\sqrt{9-4\sqrt{5}}$$

Evaluate

$4$

Factor

$2^{2}$

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