Homework Help: math

Posted by Hannah on Sunday, July 4, 2010 at 5:18pm.

simplify:

2sqrt50 - sqrt8

I am confused because of the 2 before the sqrt50

math - Damon, Sunday, July 4, 2010 at 5:25pm
2 sqrt 50 = 2 sqrt (5*5*2) = 10 sqrt 2
sqrt 8 - sqrt (2*2*2) = 2 sqrt 2

10 sqrt 2 - 2 sqrt 2 =
math - Hannah, Sunday, July 4, 2010 at 5:27pm
is 8sqrt2 correct?
math - Dereck, Sunday, July 4, 2010 at 5:28pm
The 2 before the sqrt50 just means 2 times sqrt50
Since
sqrt50=5sqrt2
and
sqrt8=2sqrt2
2*5sqrt2-2sqrt2
=10sqrt2-2sqrt2
=8sqrt2
math - Damon, Sunday, July 4, 2010 at 5:30pm
Yes, both right :)

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