document.write( "Question 192338:  how do you factor 125t cubed+8.  our book gives this answer:
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document.write( "(5t + 2)(25t squared- 10t+ 4)\r
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document.write( "thank you! \n" );
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| Algebra.Com's Answer #144364 by nerdybill(7384)     You can put this solution on YOUR website! 125t^3 + 8 \n" ); document.write( ". \n" ); document.write( "What you're suppose to see is that this is the same as: \n" ); document.write( "(5t)^3 + 2^3 \n" ); document.write( "Which is a special case -- \"sum of cubes\". \n" ); document.write( "See this web site for additional info: \n" ); document.write( "http://www.purplemath.com/modules/specfact2.htm \n" ); document.write( ". \n" ); document.write( "a^3 + b^3 = (a + b)(a^2 – ab + b^2) \n" ); document.write( "In your case: \n" ); document.write( "a is 5t \n" ); document.write( "b is 2 \n" ); document.write( ". \n" ); document.write( "Therefore: \n" ); document.write( "125t^3 + 8 \n" ); document.write( "= (5t)^3 + 2^3 \n" ); document.write( "= (5t + 2)((5t)^2 - (5t)(2) + 2^2) \n" ); document.write( "= (5t + 2)(25t^2 - 10t + 4) \n" ); document.write( " \n" ); document.write( " |