1. Evaluate the following expression(show work)
(2^-1x^4y^-3)^-2/(6x^2y^-1)^2
2. Simplify the expression to it's simplest terms(show work)
{[-x+y+(-2y)] x [x-y]} / [(x-y)^2 + (x+y)^2]
3. Simplify the expression to it's simplest terms(show work)
(x^3 + 4x^2y + 4xy^2 + 2xy - 6y^2) / (x+2y)
4. Factor the expression completely(show work)
(a+b)^2 - (2b)^2
5. Factor the expression completely(show work)
6b^2 + ab -15a^2
6. Factor the expression completely(show work)
6a^2 - ab - 15b^2
7. Factor the expression completely(show work)
9a^4 - 7a^2b^2 - 50b^4