How do you multiply $(7 + \sqrt{5}) (2 - \sqrt{5})$ $(7+sqrt5)(2-sqrt5)$ ?

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Answer 1 · 2015-04-12T18:46:52

9-5 $\sqrt{5}$ $sqrt5$

Multiplication would be 27 +2 $\sqrt{5}$ $sqrt5$ - $\sqrt{5}$ $sqrt5$ (7) - $\sqrt{5}$ $sqrt5$ $\sqrt{5}$ $sqrt5$

=14- 5*sqrt5# -5

= 9-5 $\sqrt{5}$ $sqrt5$

How do you multiply (7+√5)(2−√5)(7+sqrt5)(2-sqrt5)?