Question

Simplify the rational expression. Find all numbers that must be excluded from the domain of the simplified rational expression.

I need the bottom part

Answer 1

y ≠ 9, y ≠ 3

Explanation:

y² -12y +27 = (y - 9) (y - 3)

Denominator ≠ 0

y ≠ 9 or y ≠ 3