document.write( "Question 1106885: 1 + 2 = 3
\n" ); document.write( "4 + 5 + 6 = 7 + 8
\n" ); document.write( "9 + 10 + 11 +12 = 13 + 14 +15
\n" ); document.write( "What would the last number of the 16th equation \n" ); document.write( "

Algebra.Com's Answer #721896 by greenestamps(13200) $\"\"$ $\"About$

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\n" ); document.write( "1 + 2 = 3
\n" ); document.write( "4 + 5 + 6 = 7 + 8
\n" ); document.write( "9 + 10 + 11 +12 = 13 + 14 +15

\n" ); document.write( "Just to take the pattern one further:
\n" ); document.write( "16 + 17 + 18 + 19 + 20 = 21 + 22 + 23 + 24

\n" ); document.write( "The last numbers for the 1st, 2nd, 3rd, and 4th equations are 3, 8, 15, 24.

\n" ); document.write( "Any one of a number of methods can determine that these are the values of the polynomial $\"f%28n%29+=+n%5E2%2Bn\"$ .

\n" ); document.write( "The last number in the 16th equation is then $\"f%2816%29+=+16%5E2%2B16+=+256%2B16+=+272\"$ \n" ); document.write( "

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