Simplifying Rational Expressions: Key Concepts and Techniques

This video tutorial covers the simplification of rational expressions by factoring and canceling common factors. It provides two examples, demonstrating the process of simplifying expressions and highlights the importance of considering domain restrictions. The video emphasizes the need to maintain the original domain when simplifying expressions to avoid undefined values.

What is the primary goal when simplifying rational expressions?

• To factor and cancel common factors

• To multiply the numerator and denominator

• To add new terms for simplification

• To divide the expression by zero

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CCSS.HSA.APR.D.6

In the expression X+2 over X^2+5X+6, which term is factored from the denominator?

• X-3

• X+3

• X-2

• X+2

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CCSS.HSA.APR.D.6

What results from the cancellation in the expression X+2 over X^2+5X+6?

• X+2 over X+3

• X+3 over X+2

• 1 over X+2

• 1 over X+3

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CCSS.HSA.APR.D.6

Which factors are considered to simplify the numerator X^2+2X-15?

• X+3 and X-5

• X+5 and X-3

• X+4 and X-3

• X-2 and X+7

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CCSS.HSA.APR.D.6

What is the simplified form of X^2+2X-15 over X^2+X-12 after cancellation?

• X+5 over X+4

• X-3 over X+4

• X+4 over X+5

• X+5 over X-3

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CCSS.HSA.APR.D.6

Why can't X=-3 be used in the simplified expression X+5 over X+4?

• It makes the denominator zero in the original expression

• It results in a non-real number

• It simplifies the expression further

• It has no effect on the expression

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CCSS.HSA.APR.D.7

What happens if X=-2 is substituted into the original expression X+2 over X^2+5X+6?

• The numerator becomes zero

• No effect on the expression

• The denominator becomes zero

• The expression simplifies to 1

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CCSS.6.EE.A.2C

What is the result of substituting X=22 into the simplified expression from Example 1?

• 1 over 22

• 22 over 25

• 1 over 25

• 25 over 1

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CCSS.6.EE.A.2C

Why is it important to consider the domain of the original expression when simplifying?

• To avoid undefined values in the simplified expression

• To ensure the expression is always positive

• To make the expression more complex

• To increase the number of terms in the expression

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CCSS.HSF.BF.B.3

Which value of X is excluded from the domain of the simplified expression X+5 over X+4?

• X=-4

• X=4

• X=-5

• X=5