Question

Which expression is equivalent to b^-2/ab^-3 assume a=0 b=0

Answers:
a/b^5
1/ab^5
a^3b/1
b/a

Answer 1

b^-2/ab^-3 = b^-2/b^-3 x 1/a = b^[-2-(-3)] x 1/a = b x 1/a = b/a

Answer 2

we have

`\frac{b^(-2)} {ab^(-3)}`

we know that

`\frac{b^(-2)} {ab^(-3)} =((1)/(b^(2)))( (1)/(a))( b^(3))\\ \\=(b^(3))/(ab^(2)) \\ \\= (b)/(a)`

therefore

the answer is the option

`(b)/(a)`