Question 542858
{{{((b+4))/((b-2))}}} * {{{((b^2-4))/((b^2-16))}}}
perhaps you overlooked that the 2nd fraction contains difference of square & can be factored to:
{{{((b+4))/((b-2))}}} * {{{((b-2)(b+2))/((b-4)(b+4))}}}
Cancel (b+4) and (b-2) and you left with
{{{((b+2))/((b-4))}}}