anonymous
  • anonymous
Help with radicals
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
|dw:1434336375394:dw|
anonymous
  • anonymous
@peachpi @LeibyStrauss
anonymous
  • anonymous
do you know what the conjugate is?

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anonymous
  • anonymous
@peachpi Idk what that is
anonymous
  • anonymous
can you explain
anonymous
  • anonymous
the conjugate is where you change the sign of the radical in the denominator and multiply by it to get rid of the square root in the denominator. Your denominator is 9-√5, so the conjugate is 9+√5. So to solve your problem you need to simplify this |dw:1434336787389:dw|
anonymous
  • anonymous
@peachpi ok than what would be next?
anonymous
  • anonymous
|dw:1434337068377:dw|
anonymous
  • anonymous
the top is right. FOIL the bottom
UsukiDoll
  • UsukiDoll
the first part of the denominator is right... second part... no because when we are multiply square roots it's just that number
UsukiDoll
  • UsukiDoll
for example \[(\sqrt{3})(\sqrt{3}) = 3\] now apply that example to your problem
anonymous
  • anonymous
@UsukiDoll I'm lost so how would the denominator look?
UsukiDoll
  • UsukiDoll
\[(9-\sqrt{5})(9+\sqrt{5})\] is your denominator .. use foil.. the O and I cancels out
anonymous
  • anonymous
so it would be 81+5?
anonymous
  • anonymous
yes
UsukiDoll
  • UsukiDoll
then just add 81+5
anonymous
  • anonymous
ok thanks

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