Question 319884
(-3 / x^2 - 2x + 1) (2x / x^2 - 5x + 4) 

To find the LCD, you must factor each denominator individually.

x^2 - 2x + 1 factors to be (x - 1)(x - 1) = (x - 1)^2

x^2 - 5x + 4 factors to be (x - 4)(x - 1).

Putting all the different factors together and using the highest exponent, we get the following LCD: 

(x - 1)^2 (x - 4)...choice d