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January 31, 2015

January 31, 2015

Posted by **Peter** on Monday, October 5, 2009 at 9:01pm.

- Algebra -
**Reiny**, Monday, October 5, 2009 at 9:22pmYou probably have a something like this

(? ± √80)/??

so when you "break down" the √80 you would look for the largest perfect square which divides into 80. That would be 16

so √80 = √16 x √5

= 4√5 , which means 4 times the square root of 5

when you put that back into the formula expression you would of course keep the ±

get used to checking your work with a calculator.

find √80 and note its decimal answer

now find √5 , then multiply that by 4

You should get the same answer correct to about 8 decimal places, if not, you made a mistake.

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