Question

in an ap if the common difference is -4 and the 7th term is 4.then find the first term​

Answer 1

Answer:-

a = 28

Given:-

d = -4

$a_7 = 4$

To find :-

The first term.

Solution :-

Let a be the first term.

Now, $a_7 = 4$

$\implies$ $4 = a + 6d$

Put the value of d.

$\implies$ $4 = a + 6 (-4)$

$\implies$ $4 = a -24$

$\implies$ $a = 4 +24$

$\implies$ $a = 28$

hence, the value of first term is 28.