Question

write the value of A-B

Answer 1

2x-1/(x-2)(x-1) = a(x-1) +b (x-2)/(x-1)(x-2)

2x-1 = a(x-1) + b(x-2)

put x =1

1 = 0 - b

b=-1

put x=2

3 = a +0

a=3

a-b = 3-(-1)=3+1

a-b=4