Question

For an A.P. if the eighth term (t8) = 6, common difference (d) = -2, then what is the value of the first term (a)?​

Answer 1

Step-by-step explanation:

Given, eighth term, t(8) = 6 and d = -2

We know that, a(n) = a + ( n - 1 ) d

Applying the given values in the equation,

a(8) = a + (8-1) d

a(8) = a + (7) d

6 = a + (7×-2)

6 = a + (-14)

a = 6 + 14

a = 20