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Compute \((\sqrt{23} + \sqrt{5})(\sqrt{23} - \sqrt{5})\)

 Jul 1, 2020
 #1
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Here is a formula... (a+b)(a-b)=a^2-b^2

 

So, let's use that formula here!

\((sqrt(23)+sqrt(5))(sqrt(23)-sqrt(5))\)

would equal (sqrt(23))^2 - (sqrt(5))^2

 

This is equal to 23-5, which is 18.

 Jul 1, 2020

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