2ap's have same common difference. the 1st term of one of these is -1 and that of the other was -8. fine the difference between their 4th terms
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-1,-1+d,-1+2d.......
a = -1
d = d
n = 4
Tn = a+(n-1)d
T4 = -1+(4-1)d
T4 = -1+3d
-8,-8+d,-8+2d.........
a = -8
d = d
n = 4
t4 = -8+3d
T4-t4
= -1+3d-(-8+3d)
= -1+3d+8-3d
= -1+8
= 7
difference between 4th term is 7
a = -1
d = d
n = 4
Tn = a+(n-1)d
T4 = -1+(4-1)d
T4 = -1+3d
-8,-8+d,-8+2d.........
a = -8
d = d
n = 4
t4 = -8+3d
T4-t4
= -1+3d-(-8+3d)
= -1+3d+8-3d
= -1+8
= 7
difference between 4th term is 7
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