Example

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

Question

$$\sqrt{ { \left(4- \sqrt{ 5 } \right) }^{ 2 } }$$

Evaluate

$4-\sqrt{5}\approx 1.763932023$

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