Question

Find the 1st term of an A. P. whose 2nd term is 1 and common difference is 4​

Answer 1

Answer:

first term =-3

Step-by-step explanation:

2nd term=1

a+d=1

a+4=1

a =1-4

a=-3

Answer 2

Step-by-step explanation:

${\blue{\underline{question \: : \: - }}}$

Find the 1st term of an A. P. whose 2nd term is 1 and common difference is 4

$\pink{\bold{\underline{\underline{solution : - }}}}$

GIVEN,

$\bold{\large{a2 = 1}} \\ \bold{\large{d = 4}}$

$\boxed{\bold{\large{a1 = d - a2}}}$

$\implies{\bold{\large{a1 = 4 - 1}}} \\ \\{\implies{\bold{\large{a1 = 3}}}}$