Rational Equations and Expressions

The video tutorial explains how to solve rational equations by eliminating fractions using the least common denominator (LCD). It provides two examples: one using the LCD method and another using cross-multiplication for proportions. The tutorial emphasizes checking for excluded values to ensure valid solutions. The video concludes with a brief mention of upcoming examples in the next video.

What is the main goal when solving a rational equation?

• To find the greatest common factor

• To determine the expression to multiply both sides by to eliminate fractions

• To divide both sides by the numerator

• To add fractions on both sides

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CCSS.HSA.APR.D.6

What is the result of simplifying the expression (x * (x - 4)) / x?

• x / (x - 4)

• x * x

• x + 4

• x - 4

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CCSS.8.EE.C.7B

What type of equation is formed after eliminating parentheses in the first example?

• Quadratic equation

• Cubic equation

• Linear equation

• Exponential equation

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CCSS.HSA.APR.D.7

What is the least common denominator (LCD) for the denominators x and x - 4?

• x + x - 4

• x - 4

• x * (x - 4)

• x

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CCSS.HSA.REI.A.2

In a special case of rational equations, what method can be used instead of finding the LCD?

• Adding fractions

• Subtracting fractions

• Dividing by the numerator

• Cross-multiplication

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CCSS.HSA.REI.A.2

What must be checked after finding solutions to a rational equation?

• If solutions are even numbers

• If solutions are positive

• If solutions are integers

• If solutions make any denominator zero

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CCSS.7.RP.A.3

In the second example, what is the shortcut method used to solve the proportion?

• Adding fractions

• Finding the LCD

• Cross-multiplication

• Subtracting fractions

What is the common factor in the expression 2x^2 - 10x + 12?

• 4

• 5

• 2

• 3

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CCSS.HSF-IF.C.7D

What are the excluded values in the second example?

• x = 8 and x = -2

• x = 0 and x = 4

• x = 3 and x = 2

• x = 7 and x = -3

Why is it important to check the original equation after solving?

• To check if the solutions are even numbers

• To confirm the solutions are integers

• To verify the solutions do not make any denominator zero

• To ensure the solutions are positive