document.write( "Question 858064: 4th and 7th term of an AP are 9 and 21 respectively. Find the 1st eight terms of the sequence \n" ); document.write( "
Algebra.Com's Answer #517035 by richwmiller(17219)\"\" \"About 
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an = a + (n - 1)d
\n" ); document.write( "21= a + 6d
\n" ); document.write( "9 = a + 12
\n" ); document.write( "12=3d
\n" ); document.write( "d=4
\n" ); document.write( "a=-3
\n" ); document.write( "-3+4=1 etc\r
\n" ); document.write( "\n" ); document.write( "-3,1,5,9,13,17,21,25
\n" ); document.write( "
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