Best gets brainliest and thanks and five stars and whatever

Simplify the expression:

-9 x^4 y^2 + x^2 y^3 - 12 x^4 y^4

Step-by-step explanation:

you combine like terms for the x^4 and y^2 terms:

      : you get -9x^4y^2

you combine like terms for the x^2 and y^3 terms:

      : you get x^2y^3

you combine like terms for the x^4 and y^4 terms:

      : you get -12x^4y^4

ps: the ^ symbol means the base to that power so (x^4 = x to the 4th power)

Hope I helped you ;)