document.write( "Question 248997: simplify: \r
\n" ); document.write( "\n" ); document.write( "cube root of 144+cube root of 2/3-5 times cube root of 18 \r
\n" ); document.write( "\n" ); document.write( "-Tammam Ahmed
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Algebra.Com's Answer #181454 by jsmallt9(3758)\"\" \"About 
You can put this solution on YOUR website!
\"root%283%2C+144%29+%2B+root%283%2C+2%2F3%29+-+5root%283%2C+18%29\"
\n" ); document.write( "We cannot add or subtract any of these terms because they are not like terms (yet). But we can simplify them. There are two parts to simplifying radicals:
  • Factoring out perfect powers of the root. (In this case we will be factoring out perfect cubes where possible.)
  • Rationalizing denominators.

\n" ); document.write( "The first cube root has a perfect square factor. The middle cube root needs to be rationalized:
\n" ); document.write( "\"root%283%2C+8%2A18%29+%2B+root%283%2C+%282%2F3%29%289%2F9%29%29+-+5root%283%2C+18%29\"
\n" ); document.write( "\"root%283%2C+8%29%2Aroot%283%2C+18%29+%2B+root%283%2C+18%2F27%29+-+5root%283%2C+18%29\"
\n" ); document.write( "\"2%2Aroot%283%2C+18%29+%2B+root%283%2C+18%29%2Froot%283%2C+27%29+-+5root%283%2C+18%29\"
\n" ); document.write( "\"2%2Aroot%283%2C+18%29+%2B+root%283%2C+18%29%2F3+-+5root%283%2C+18%29\"
\n" ); document.write( "Each cube root is now simplified. And they are now like terms! So we can add and subtract them. Of course we need common denominators first:
\n" ); document.write( "\"6%2Aroot%283%2C+18%29%2F3+%2B+root%283%2C+18%29%2F3+-+15root%283%2C+18%29%2F3\"
\n" ); document.write( "\"-8%2Aroot%283%2C+18%29%2F3\"
\n" ); document.write( "or
\n" ); document.write( "\"%28%28-8%29%2F3%29%2Aroot%283%2C+18%29\"\r
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