# More math help..?

So we have this equation: ((4√3)+(√5)) x ((√3)-6√5)) Sorry if thats written in a confusing manner.

And my professor writes "Assume that no radicands were formed by raising negative quantities to even powers."

I'm not sure what this means?

### 3 Answers

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- MorningfoxLv 72 weeks ago
Sorry, I must be needing glasses. Could you tell me where the equals sign is?

- Jim MoorLv 72 weeks ago
First, lose the unnecessary parens

(4√3 + √5) x (√3 - 6√5)

Now use FOIL to distribute

4√3√3 - 24√3√5 + √3√5 - 6√5√5

4*3 - 24√3√5 + √3√5 - 6*5

combine like items

12 -23√3√5 -30

-18 -23√3√5

or

-(18 +23√15)

BTW I have no clue what the teacher was saying...

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