To simplify the expression, we need to divide the coefficients and the variables separately.
12y^3 / -42y^5 = (12 / -42)y^(3 - 5) = -1/3y^(-2) = -1 / 3y^2
12z^8 / 39z = (12 / 39)z^(8 - 1) = 4/13z^7
Therefore, the simplified expression is:
-1 / 3y^2 + 4 / 13z^7
To simplify the expression, we need to divide the coefficients and the variables separately.
12y^3 / -42y^5 = (12 / -42)y^(3 - 5) = -1/3y^(-2) = -1 / 3y^2
12z^8 / 39z = (12 / 39)z^(8 - 1) = 4/13z^7
Therefore, the simplified expression is:
-1 / 3y^2 + 4 / 13z^7