Let
[tex]x=ab^{2} \\ y=a^{2}b^{2}[/tex]
we know that
if x and y are equivalent
then
[tex]\frac{x}{y} =1[/tex]
so
Divide the value of x by y
[tex]\frac{x}{y} = \frac{ab^{2}}{a^{2}b^{2}}= \frac{1}{a} \\\\ \frac{1}{a} \neq 1[/tex]
therefore
The expressions are not equivalent
