The 8th term of an arithmetic sequence is 12 and its 12th term is 8 . what is the algebraic expression for this sequence? common difference using (common difference =term difference ÷position difference and 1st term and also algebra of the sequence using (xn=dn+(f-d) )
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7
Answer:
Hope it helps you.
Step-by-step explanation:
a8 = a+7d= 12 [ eq 1]
a12 =a+11d = 8 [ eq 2]
subtract eq1 from eq 2, we get
4 d = -4
d= -1
a + 7d = 12
a + -7 = 12
a= 12+7 = 19
the AP is,
19, 18, 17, 16, 15,...= a, a+1d, a+2d, a+3d...
Answered by
2
ANS:
In the form of
Xn=an+b
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