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Exercise

$\left(a+\sqrt{5}\right)\left(\sqrt{5}-a\right)$

Step-by-step Solution

1

The sum of two terms multiplied by their difference is equal to the square of the first term minus the square of the second term. In other words: $(a+b)(a-b)=a^2-b^2$.

$5-a^2$

Final answer to the exercise

$5-a^2$

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