Question

In an A.P., if d = -4, n = 7, an = 4 then a is -
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Answer 1

$\underline{ \underline{\large\green➥ \large{ \tt \red{Given:-}}}}$

➼$\sf{Common\: difference ,d = -4 }$

➼$\sf{No\: of \:Term,n= 7}$

➼$\sf{nth\:term,a_n = 4 }$

$\underline{ \underline{\large\purple➥ \large{ \tt \orange{To\: Find:-}}}}$

➼$\sf{First \:term,a }$

$\underline{ \underline{\large\blue➥ \large{ \tt \green{Solution:-}}}}$

General term of an A.P is given by-

$\pink { \underline { \boxed{ \sf{a_n = a+(n-1)d}}}}$

Putting Values-

$\large↦$$\sf{4 = a +(7-1) ×(-4)}$

$\large↦$$\sf{4 = a +6×(-4)}$

$\large↦$$\sf{4 = a +(-24)}$

$\large↦$$\sf{4 = a -24}$

$\large↦$$\sf{4 +24= a }$

$\large↦$$\boxed{\sf{a= 28}}$

Answer 2

Answer:

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