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!

Let's apply this to rational expressions!

Multiple Choice

When we multiply rational expressions we multiply...

• Straight across

• Diagonally

Let's do another one!

Multiple Choice

In order to get to our final answer, we

• Cancelled out like terms

• Cancelled out different terms