Finding Least Common Denominator of Rational Expressions

• x + 3

• (3-x)(x-3)

• 3 - x

• x - 3

My answer is incorrect! :-O Look over my work. Where did I go wrong?

• Step 1 - incorrect factoring

• Step 2 - incorrect factoring

• Step 3/4 - incorrect factor for the least common multiple

• Step 5 - incorrect distributing

• Step 8 - incorrect reducing

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)

You need a Common Denominator to

• add rational expressions

• subtract rational expressions

• multiply rational expressions

• divide rational expressions

The smallest positive number that is a multiple of two or more numbers

• Least Common Multiple (LCM)

• Greatest Common Factor (GCF)

• Vertical Asymptote (VA)

• Point of Discontinuity (POD)

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