The x’s must all be different. So if any x’s repeat it is not a function
Put the whole number over 1,
2 x 3/4
2/1 x 3/4
Now you would multiply across
6/4
3x^2 + 4x - 21x - 28
x(3x + 4) - 7(3x + 4)
(3x + 4) (x - 7)
Answer: B).
2,3,6 because 2 and 3 cant equal 6