Answer:
You are correct
This is my answer: -3x^a y^f+b z^g+c
Explanation:
(3x^a y^b z^c) (-y^f z^g)
-3x^a y^f+b z^g+c
Because both have the same base is y, so we add both f and b
Same with z, both have the same base is z, so we have z^g+c
My answer is different in order, but both are correct!