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posted by dany Saturday, February 9, 2013 at 9:48am.
determine the secon termof an A.P whose sixth term is 12 and eighth term is 22?
a(n) = a₁ +(n-1)d a(6) = a₁ +(6-1)d=12 a(8) = a₁ +(8-1)d=22 a₁ +5d=12 a₁ +7d=22 a₁ = -13 d=5 a(2) = a₁ +(2-1)d= =-13 +5= =-8
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