Question

The rational function y= x2+3 over x2-1 has a range of (blank)

Answer 1

D

Explanation:

y(x²-1) = x² + 3

x²y - y - x² = 3

x²(y-1) = 3 + y

x² = 3/(y-1) + y/(y-1)

y ≠ 1