anonymous
  • anonymous
(3sqrt(7) -6sqrt(3)) (3sqrt(7) +9sqrt(3)) multiply to solve.
Mathematics
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anonymous
  • anonymous
(3sqrt(7) -6sqrt(3)) (3sqrt(7) +9sqrt(3)) multiply to solve.
Mathematics
chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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anonymous
  • anonymous
I got -99+9sqrt(21)
anonymous
  • anonymous
1.) 3sqrt(2) * [3 + sqrt(2)] Distribute for each term: 9sqrt(2) + 3sqrt(2)*sqrt(2) (Multiplying like roots cancels it out to the actual number, 2 in this case) 9sqrt(2) + 3*2 9sqrt(2) + 6 2.) 4 + sqrt(20)/2 Assuming that the 2 is being divided into ONLY the sqrt(20)... 4 + 2sqrt(5)/2 (The 2s cancel here because of division) 4 + sqrt(5) In the case that the 2 is being divided into BOTH the 4 and the sqrt(2)... [4 + 2sqrt(5)]/2 2 + sqrt(5) 3.) 12sqrt(18)/3sqrt(2) Again, simplify the roots as much as possible... 12*3sqrt(2)/3sqrt(2) (The 3sqrt(2) cancels because of division) 12 So, your answers are 1.) 9sqrt(2) + 6 2.) 4 + sqrt(5) (or 2 + sqrt(5), depending) 3.) 12
anonymous
  • anonymous
Wow, great explanation!

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anonymous
  • anonymous
\[(3\sqrt{7} -6\sqrt3) (3\sqrt7 +9\sqrt3) = 9*7 + 27\sqrt21 - 18\sqrt21 - 54*3 = 63 + 9\sqrt21 - 162 = -99 + 9\sqrt21\]
anonymous
  • anonymous
or that lol
anonymous
  • anonymous
Thanks
anonymous
  • anonymous
so the answer is 63+9sqrt(21-16)

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