Simplify completely. x 2 - 20x + 32 / x 2 - 2x - 80

This is usually considered to be the simplified form. The numerator zeros are irrational, so the numerator has no integer factors. The denominator zeros are x=-8, 10, but "simplified" usually means "multiplied out, rather than factored."

If you wanted to, you could write the expression as

... 1 - (34/9) / (x - 10) - (128/9) / (x + 8)

This is more suitable for finding asymptotes and for doing integration, but may not be considered "simplified."