Example

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

Question

$$f(x)= \sqrt{ { x }^{ 2 } -4 }$$

Evaluate

$\sqrt{x^{2}-4}$

Factor

$\sqrt{x-2}\sqrt{x+2}$

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