write witout parentheses (-3y^3x^2)?

(-3y^3x^2)=
-3y^3x^2

Okay, I'll try.

-3y^3x^2

How's that?

is this -3y raised to 3x raised to 2? That would be pretty hard
-3y^3 (3x^2)
= -3y^(9x^2)
OR do you mean to say -3y raised to 3 times 3x raised to 2?
-3y^3 (3x^2)
= -9x^2 times (y^3)

-3y^6x

(-3y^3x^2)
= -3x^2y^3

It does not need parentheses, it is in fact as follwing:

-3((y)^3(x^2))

( -3 y³ ) ( x² ) = - 3 x² y³