Question

In an AP, if the common difference (d) = –4, and the seventh term (a7) is 4, then find the first term

Answer 1

I hope this answer will help you

Answer 2

$\sf{\large{\underline {ARITHMETIC \:PROGRESSIONS}}}$ :

Given, Common difference, d = - 4

Seventh term, A7 = 4

A7 = a + ( 7 - 1 ) d

4 = a + 6( - 4 )

4 = a - 24

a = 4 + 24 = 28

So, First term of the A. P., a = 28.