Question

Find the least common denominator for the following rational expressions. (r – 1)(r – 4)(r – 5) (r – 1)(r + 4)(r – 5) (r – 1)(r + 1)(r – 4)(r – 5) (r – 1)(r + 1)(r + 4)(r – 5)

Answer 1

Answer:

(r - 4)(r - 1)(r - 5)(r + 1)

Step-by-step explanation:

We can simply look at the denominators and factor them.

First: (r - 4).

Second: (r - 4) (r - 1).

Third: (r - 5)(r + 1).

In order to find the LCD, simply create a common denominator.

The smallest value that would make this rational expression have a common denominator would be:

(r - 4)(r - 1)(r - 5)(r + 1).

Answer 2

Answer: option 3       (r – 1)(r + 1)(r – 4)(r – 5)

Step-by-step explanation: edg2020