Least Common Denominator of Rational Expressions

When adding and subtracting rational expressions, my first step should be to:

• Combine like terms in the numerators.

• Determine a Least Common Denominator.

• Factor all of the numerators and all of the denominators.

• Change the operator to multiplication and reciprocate the second fraction.

Find the LCD of the following rational numbers

5/4 and 2/3

• 12

• 5

• 24

• 7

Find the LCD of the following rational numbers

• 10

• 5

• 15

• 20

Find the LCD of the following rational expression

5/(x+8) and 2x/(x-3)

• (x+8)(x-3)

• 8x(x+2)

• (x²+3x+24)

Find the LCD of the following rational expressions

• (x+1)(x-1)

• (x+1)² (x-1)

• (2x+2)

• (x+1)(x-1)

• (x+1)² (x-1)

• (2x+2)

• (x+1)(x-1)

• (x+1)² (x-1)

• (2x+2)

• (x+1)(x²-1)

Find the LCD of the following rational expressions

2x/(x+1) and (x²-1)

• (x+1)(x-1)

• (x+1)² (x-1)

• (2x+2)

Perform the operation

• A

• B

• C

• D

• A
• B
• C
• D