We know that x + y = 3, xy = - 12, x ^ 2-xy + y ^ 2

We know that x + y = 3, xy = - 12, x ^ 2-xy + y ^ 2

Original formula = x ^ 2 + 2XY + y ^ 2-3xy
=(x+y)^2-3xy
=3^2-3*(-12)
=9+36
=45