anonymous
  • anonymous
Simplify 3√5 - 2√7 + √45 -√28. 2√12 2√2 6√5 - 4√7 6√10 - 4√14
Mathematics
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anonymous
  • anonymous
Simplify 3√5 - 2√7 + √45 -√28. 2√12 2√2 6√5 - 4√7 6√10 - 4√14
Mathematics
jamiebookeater
  • jamiebookeater
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UnkleRhaukus
  • UnkleRhaukus
what are prime factors of 45?
anonymous
  • anonymous
5 , 15, 3
UnkleRhaukus
  • UnkleRhaukus
15 is not prime

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anonymous
  • anonymous
5?
anonymous
  • anonymous
ok i gt ya
UnkleRhaukus
  • UnkleRhaukus
45 = 3 * 3 * 5 right?
anonymous
  • anonymous
yes
UnkleRhaukus
  • UnkleRhaukus
you have one term that is √45 √45 = √(3 * 3 * 5) = √(3^2 * 5) = √3^2 * √5 = 3 * √5
UnkleRhaukus
  • UnkleRhaukus
because √x^2 = x and √(x * y) = √x * √y
UnkleRhaukus
  • UnkleRhaukus
do you know the prime factorization of 28?
anonymous
  • anonymous
\[3\sqrt{5}-2\sqrt{7}+3\sqrt{5}+\sqrt{9}\sqrt{5}-2\sqrt{7}\]\[3\sqrt{5}+3\sqrt{5}-2\sqrt{7}-2\sqrt{7}\]\[6\sqrt{5}-4\sqrt{7}\]
anonymous
  • anonymous
|dw:1438494763109:dw|
anonymous
  • anonymous
dayum you draw better than me
anonymous
  • anonymous
haha...took me long enough...
anonymous
  • anonymous
i tried to show draw the steps to find 3x3 determinant and it went out of screen yesterday
anonymous
  • anonymous
i tried answering a question yesterday but dont know if my approach was right..would u mind checking that out.. though the question is already closed..
anonymous
  • anonymous
sure send me da link
anonymous
  • anonymous
oh wow thank
anonymous
  • anonymous
i didn't see that
anonymous
  • anonymous
|dw:1438495588987:dw| i don't understand how the circle part is the answer
anonymous
  • anonymous
3*3*5 ??? how does that turn into that
anonymous
  • anonymous
nick, i would go with welsh drawing lol yours looks kinda complicated. \[45=3*3*5\]\[\sqrt{45}=\sqrt{9}\sqrt{5}=3\sqrt{5}\]
anonymous
  • anonymous
OH. WOW THANK YOU
anonymous
  • anonymous
|dw:1438495869837:dw|
anonymous
  • anonymous
@saseal thanks anyways for looking...
anonymous
  • anonymous
i used to look at it this way \[\sqrt{2}=2^{\frac{ 1 }{ 2 }}\]
anonymous
  • anonymous
yw
anonymous
  • anonymous
|dw:1438496337543:dw|
anonymous
  • anonymous
oh. ok thank you

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