Expand this expression, write your answer in the form of a + b$$\sqrt{c}$$ where a, b, c are integers: 1) $$\sqrt{5}$$ (2+$$\sqrt{5}$$)?

Question

anonymous · Answer

√5(2+√5)? - I mean this, sorry im new to the symbols on the site.

anonymous · Answer

It's not clear. You need to write it again.

anonymous · Answer

=$$2\sqrt{5}+25$$

anonymous · Answer

Hm, ah yes- thank you agdg :)- Is it possible to tell me how you got to that answer, I forgot the method on doing it, if its not too much hassle hehe :)

anonymous · Answer

:p

anonymous · Answer

Simply multiple each term within the parentheses by $$\sqrt{5}$$

anonymous · Answer

:P

anonymous · Answer

Ah yes, but I dont understand why √5 X √5 = 25, what if it was √5 X √4 = 20?, Or am i wrong on that?

anonymous · Answer

$\sqrt{5}(2+\sqrt{5})=2\sqrt{5}+5$.

anonymous · Answer

$\sqrt{5}\times\sqrt{5}=5$, $\sqrt{4}\times \sqrt{4}=4$... and so on!