Any help is greatly appreciated
1.
20a^2b 12xy^3
______ * ______
3xy 5ab^2
2. is solved
a^2-1 6+15a
_____ * ______
2+5a 3-3a
$\displaystyle \frac{a^2 - 1}{2+5a} * \frac {6+15a}{3-3a}$
$\displaystyle \frac{(a + 1)(a - 1)}{2 + 5a} * \frac{3(2 + 5a)}{3(1 - a)}$
cancel (2 + 5a) and cancel 3
$\displaystyle \frac {(a + 1)(a - 1)}{(1 - a)}$
$\displaystyle \frac {(a + 1)(a - 1)}{-(a - 1)}$
cancel (a - 1)
$\displaystyle -(a + 1)$