
Roberta S.
asked 11/18/15Formula to find a1 from an=a1+(n-1)d
Need help with the above equation
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1 Expert Answer

James B. answered 06/25/16
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We can solve for a1, in terms of the other variables
an = a1 + (n - 1)d
a1 + (n - 1)d = an
a1 + dn - d = an
a1 = an - dn + d
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Mark M.
11/18/15