How do you factor the trinomial x squared + xy + 2y squared

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)