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need help with simplifying radicals

Mathematics
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|dw:1341559210514:dw|
the trick with these is to look at the number under the square root sign and see if you can express it as a product of a number that is a perfect square.
so think of how you can form 63 as a product of two numbers, one of which is a perfect square

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Other answers:

nope its not a perfect square
63 is not a perfect square, but can you express 63 as the product of two other numbers, one of which is a perfect square?
can i do a factor tree?
yes
ohk hold on
ok
i got |dw:1341559648703:dw|
thts wat i got? ignore the bottom part
not quite:\[\sqrt{63}=\sqrt{9*7}=\sqrt{3^2*7}=3\sqrt{7}\]
you have swapped the 3 and 7
yea thts wat i meant
ok, now don't forget you also have to multiply by that 5 in the original question
so 5 times the answer we got?
yes - thats right
so what do you get for your final answer?
ohk hold on dnt leave yet
I won't - don't worry :)
i got a decimal?
leave the answer in radical form
ohhhhh
|dw:1341559908464:dw|
perfect! well done!
thnk u!!!!
yw :)

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