What is the product of $(3 + \sqrt{5})$ $(3 + sqrt5)$ and $(3 - \sqrt{5})$ $(3- sqrt5)$ ?

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Answer 1 · 2015-12-30T01:59:35

See solution presented below.

(3 + √5)(3 - √5)
= 9 + 3√5 - 3√5 - √25
= 9 - 5
= 4

The product is 4.

Hopefully you understand now.

What is the product of (3 + sqrt5)(3+√5)(3 + sqrt5) and (3- sqrt5)(3−√5)(3- sqrt5)?