Question

For an giren A.P t7=4, d = -4
then find a= ?​

Answer 1

Answer:

T7 = 4

a+(n-1) d = 4

a +(7-1)(-4) = 4

a-24 = 4

a= 28

I am 100% sure this is correct .hope also helpful.

Answer 2

Question :-

For an given Algebraic t7 = 4 , d = -4 then find t =?

Given :-

AP is a list of numbers in which each term obtained by adding a fixed number to the preceeding term except the first term.

Here,

a7 = t + 6d = 4

Common difference = -4

To Find :

The value of first term t = ?

Solution :-

Common difference = -4

t7 = t + ( 7 - 1 ) d

t7 = t + 6d

Put the value of d in the term of AP

t7 = t + 6 * -4 = 4

= t - 24 = 4

= t = 4 + 24

= t = 28

So ,The value of first term ( t) is = 28

Related formulas : -

This formula is used to find number of terms

Here, a = first term, d = Common difference and n = no .of terms.

• an = a + ( n - 1 ) d

This formula is used to find the sum of given terms . Here, a = first term,

d = common difference , sn = Sum of terms,n = no .of terms .

• Sn = n/2 ( 2a + ( n - 1 )d)