Add Subtract Rationals

To add or subtract rational expressions we must have a _____________:

• greatest common factor

• common denominator

• calculator

• proportion

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CCSS.HSA.APR.D.7

Perform the indicated operation and simplify: \frac{x^2+5x-34}{x^2-9x+8}-\frac{10}{x-8}

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CCSS.HSA.APR.D.7

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CCSS.HSA.APR.D.7

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CCSS.HSA.APR.D.7

What is the numerator of the simplified answer:

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CCSS.HSA.APR.D.7

Subtract. Simplify completely.

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CCSS.HSA.APR.D.7

• A.
• B.
• C.
• D.

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CCSS.HSA.APR.D.7

• A.
• B.
• C.
• D.

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CCSS.HSA.APR.D.7

Find the LCD of these fractions.  Start by factoring denominators!

• (x+2)(x-2)

• (x+2)

• (x-2)

• (x²-4)(x+2)

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CCSS.HSA.APR.D.7

Subtract the fractions

• a

• b

• c

• d

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CCSS.HSA.APR.D.7