anonymous
  • anonymous
Simplify: 5 sqrt 3 (2 sqrt 3 + 6 sqrt 19) 30 + 30 sqrt 57 90 + 30 sqrt 57 10 sqrt 3 + 30 sqrt 19 10 sqrt 3 + 30 sqrt 57
Mathematics
katieb
  • katieb
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phi
  • phi
same idea: distribute then combine sqrt's
anonymous
  • anonymous
im not sure how i would but it in distubutive property
anonymous
  • anonymous
put

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anonymous
  • anonymous
5 srqt 3 (2 sqrt3 sqrt 3 + 6 sqrt 3 sqrt 19)??
phi
  • phi
in letters: A * (B+C) = A*B + A*C take the "stuff" in front (in this case 3 sqrt3 ) and multiply it times each thing inside
phi
  • phi
5 sqrt 3 (2 sqrt 3 + 6 sqrt 19) you have two terms inside the parens: 2 sqrt3 and 6 sqrt19 you multiply each term by 5 sqrt3 for the first term just write it like this 5*sqrt3 * 2 * sqrt3 ( I put in * to show the multiplication, but in algebra you normally don't show the multiplication sign, and just know it is there.) however, put the numbers first (when you multiply you can switch the order) 5*2 * sqrt3 * sqrt3 you know what 5*2 is , right ? do you know what sqrt3 * sqrt3 is ? and do the same thing for the 2nd term: 6 sqrt19
anonymous
  • anonymous
ok so 10 sqrt 6 and 5 * sqrt 3 * 6 * sqrt 19 giving me 5 * 6 and sqrt 3 * sqrt 19 then giving me 30 sqrt 57 Answer = 10 sqrt 6 + 30 sqrt 57
phi
  • phi
giving me 5 * 6 and sqrt 3 * sqrt 19 then giving me 30 sqrt 57 that part is correct. do the first part again 5*2 * sqrt3 * sqrt3
anonymous
  • anonymous
5*2 = 10 sqrt 3 * sqrt 3 = sqrt 9 10 sqrt 9
phi
  • phi
yes. but what is the square root of 9 ?
anonymous
  • anonymous
3
phi
  • phi
yes so 10*sqrt(9) is 10*3 or 30
anonymous
  • anonymous
ok
anonymous
  • anonymous
so right now im looking at D for my answer
phi
  • phi
what is the first term? (5*2 * sqrt3 * sqrt3) + (5 * sqrt 3 * 6 * sqrt 19)
anonymous
  • anonymous
the first term is 10 sqrt 9 simplified its 10 sqrt 3
anonymous
  • anonymous
next term is 30 sqrt 57
phi
  • phi
the first term is 10 sqrt 9 simplified its 10 sqrt 3 <-- no. sqrt(9) is 3 square root of 9 is 3 because 3*3=9
anonymous
  • anonymous
ok
phi
  • phi
so if you see sqrt(3*3) you know that is 3
anonymous
  • anonymous
ok
phi
  • phi
so, the answer for this question is 10 sqrt 9 simplified its 10 *3 =30 for the first term.
anonymous
  • anonymous
ok
phi
  • phi
can you get the answer ?
anonymous
  • anonymous
A
phi
  • phi
yes, also I noticed a typo in my rules: sqrt(x) * sqrt(x) = x is the rule or sqrt( x*x) = x or sqrt(x^2) = x <-- (it is x, not 2 like I had) those are 3 different ways of saying the same thing. try to remember this rule.
anonymous
  • anonymous
ok thanks i'll post the last question if ur ready
phi
  • phi
ok

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