anonymous
  • anonymous
need help with simplifying radicals
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
|dw:1341559210514:dw|
asnaseer
  • asnaseer
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.
asnaseer
  • asnaseer
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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anonymous
  • anonymous
nope its not a perfect square
asnaseer
  • asnaseer
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?
anonymous
  • anonymous
can i do a factor tree?
asnaseer
  • asnaseer
yes
anonymous
  • anonymous
ohk hold on
asnaseer
  • asnaseer
ok
anonymous
  • anonymous
i got |dw:1341559648703:dw|
anonymous
  • anonymous
thts wat i got? ignore the bottom part
asnaseer
  • asnaseer
not quite:\[\sqrt{63}=\sqrt{9*7}=\sqrt{3^2*7}=3\sqrt{7}\]
asnaseer
  • asnaseer
you have swapped the 3 and 7
anonymous
  • anonymous
yea thts wat i meant
asnaseer
  • asnaseer
ok, now don't forget you also have to multiply by that 5 in the original question
anonymous
  • anonymous
so 5 times the answer we got?
asnaseer
  • asnaseer
yes - thats right
asnaseer
  • asnaseer
so what do you get for your final answer?
anonymous
  • anonymous
ohk hold on dnt leave yet
asnaseer
  • asnaseer
I won't - don't worry :)
anonymous
  • anonymous
i got a decimal?
asnaseer
  • asnaseer
leave the answer in radical form
anonymous
  • anonymous
ohhhhh
anonymous
  • anonymous
|dw:1341559908464:dw|
asnaseer
  • asnaseer
perfect! well done!
anonymous
  • anonymous
thnk u!!!!
asnaseer
  • asnaseer
yw :)

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