Posted by **Alex** on Sunday, January 9, 2011 at 6:37pm.

sqrt(45)+ sqrt(20)+ sqrt(5)-sqrt(125)=??

I came up with 6sqrt5 I know it's wrong. I think I messed up the breakdown of the sqrt of 125

- algebra -
**Damon**, Sunday, January 9, 2011 at 6:41pm
sqrt(125) = sqrt (5*25) = 5 sqrt(5)

- algebra -
**drwls**, Sunday, January 9, 2011 at 6:42pm
sqrt(9*5) + sqrt(4*5) + sqrt5 - sqrt(25*5)

= (3 +2 +1 -5)sqrt5 = sqrt5

- algebra -
**Alex**, Sunday, January 9, 2011 at 6:42pm
So is the answer 6sqrt(5)?? Thank you

- algebra -
**Damon**, Sunday, January 9, 2011 at 6:44pm
sqrt (9*5)+sqrt(4*5)+sqrt(5) -5 sqrt(5)

3 sqrt(5) +2 sqrt (5) + 1 sqrt(5) - 5 sqrt (5)

that is

1 sqrt(5)

- algebra -
**Alex**, Sunday, January 9, 2011 at 6:44pm
ohhh I see what I did wrong Thanks you 2

- algebra -
**Damon**, Sunday, January 9, 2011 at 6:44pm
No, it is NOT 6 sqrt(5)

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