in an ap if tje common diffrenceis equal to -4and the seventh term id 4then find the first term

in an ap if tje common diffrenceis equal to -4and the seventh term id

1.	in an ap if tje common diffrenceis equal to -4and the seventh term id 4then find the first term
Answer» an\xa0= a + (n - 1)da7\xa0= a + (7 - 1)da + 6d = 4a + 6(-4) = 4{tex}\\Rightarrow{/tex} a = 28