Aim: How do we add or subtract rational expressions?

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Presentation transcript:

Aim: How do we add or subtract rational expressions? Do Now: 1. Add: 2. Subtract: 3. Add: HW: p.56 # 14,16,18,20,24 p.75 # 6,10,12

How do we add the fractions if the denominators are different polynomials? We first need to factor all the denominators, then find the LCD How do we find LCD? The LCD is the product of all of the factors of the first denominator times all factors of the second that are not factors of the first.

Subtract: LCD is (x – 3) (x – 1) (x + 3)

Simplify:

The length and width of a rectangle are Find the perimeter of the rectangle in terms of x Multiply both length and with by 2 and factor both denominators LCD is (x – 4)(x + 1)(x – 2)

Simplify the following rational expressions Drill Simplify the following rational expressions 1. 2. 3.