Question

Two APs have the same common diffrence. The first term of one of these is -1 and that of the other is -8. Then the diffrence between their 4th terms is..
step by step explanation plz​

Answer 1

Answer:

Answer- 7

Step-by-step explanation:

Let APs be

a1,a2,a3.... &. b1,b2,b3.....

Let common difference of both APs be d and both APs have n terms.

Given that-

a1= -1

b1= -8

Now according to question-

We have to find (a4-b4)

Solution-

a4-b4

= [a1+(n-1)d]-[b1+(n-1)d]

= [-1+nd-d]-[-8+nd-d]

= [-1+nd-d+8-nd+d]

= [-1+8]

= 7