Question

what is the solution of this question (a-¹+b-¹)-¹​

Answer 1

Answer:

a(a-1)-b(b-1)

writing above in expanded form

= a²-a-b²+b

rearranging above

= a²-b²-(a-b)

expanding a²-b²

= (a+b)(a-b)-(a-b)

taking (a-b) as common factor

(a-b)[(a+b)-1]

simplifying square bracket

(a-b)(a+b-1)

Answer 2

Answer:

x^-1 = 1/x

(a^-1 + b^-1)^-1

(1/a+1/b)^-1

(b+a/ab)^-1

ab/b+a