If u1=-1, u2=-5 and ur=a+br, find a, b and u6
The given sequence can be represented as u1, u2, u3, u4, u5, u6 where u1 = -1 and u2 = -5.
Since the sequence is in linear form, we can write:
u1 = a + b(1)
u2 = a + b(2)
Solving these two equations, we get:
a = -3, and b = -2
Using the same formula, we can find the value of u6:
u6 = a + b(6)
u6 = -3 - 2(6)
u6 = -15
Therefore, a = -3, b = -2, and u6 = -15