Question

For an A.P. if t8 = 6, d = - 2, then what is the value of a ?

Answer 1

Answer:

a=20

Step-by-step explanation:

d=-2

t₈=6

a=?

t₈=a+7d      [a-(n-1)d]

6=a+7×(-2)

6=a-14

a=20

Answer 2

GIVEN :

For an A.P. if t8 = 6

d = - 2

TO FIND:

value of a

FORMULA USED:

• Tn = a + (n-1)d

SOLUTION :

Tn = a + (n-1)d

T8 = a+(n-1)d

6 = a+(8-1)(-2)

6 = a+ (7 × -2)

6 = a+ (-14)

6+14 = a

20 = a

ANSWER => a = 20

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