1/9 -PCHS-M3-Multiplying Rational Expressions Lesson

Multiplying Rational Expressions

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What is a rational expression?

Multiple Choice

What is a rational expression?

• A quotient of two polynomials.

• The difference between two polynomilas.

• The sum of two polynomials.

• The product of two polynomials.

Operations with Polynomials

• We can add them.

• We can subtract them.

• We can multiply them.

• We can divide them.

• And any other mathematical iteration...

Multiple Select

What mathematical operations can be done to rational expressions?

• All mathematical operations.

• Some mathematical operations.

Multiplying Rational Expressions

• Step 1 See if any of the expressions can be simplified.

• Step 2 Multiply the numerators.

• Step 3 Multiply the denominators.

• Step 4 Simplify if you can.

Poll

I can simplify the following!

x^2 +5x -14

• Yes!

• No, no ma'am!

• Get me started!

Multiple Choice

How do the numbers -14 and +5 relate?

• -14 is a result of the numbers we multiplied and then combined to get +5

• -14 is a result of the numbers we combined and then multiplied to get +5

Let's remind ourselves of how to multiply fractions! After all Rational Expressions are the grown up version of fractions!

Fill in the Blank

When we multiply fractions we multiply _____________ across.

Let's apply this to rational expressions!

Multiple Choice

When we multiply rational expressions we multiply...

• Straight across

• Diagonally

Let's do another one!

Fill in the Blank

We _________ both the numerator and denominators first.

Multiple Choice

In order to get to our final answer, we

• Cancelled out like terms

• Cancelled out different terms