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There is an agreement

in mathematics

that we don’t leave a radical

in the denominator

of a fraction.

Slide 3

So how do we change the denominator of a fraction?

(Without changing the value of the fraction, of course.)

Slide 4

The same way we change the denominator of any fraction!

(Without changing the value of the fraction, of course.)

Slide 5

We multiply the denominator

by the same number.

and the numerator

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By what number

to a rational number?

to change it

can we multiply

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The answer is . . .

. . . by itself!

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Remember,

is the number we square

to get n.

we’d better get n.

So when we square it,

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Because we are changing the denominator

we call this process rationalizing.

to a rational number,

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Rationalize the denominator:

(Don’t forget to simplify)

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Rationalize the denominator:

(Don’t forget to simplify)

(Don’t forget to simplify)

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When there is a binomial with a radical in the denominator of a fraction, you find the conjugate and multiply. This gives a rational denominator.

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Multiply by the conjugate.

FOIL numerator and denominator.

Next

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Simplify

·

=

Slide 17

Combine like terms

Try this on your own:

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- Newton’s third law of motion
- History of Modern Astronomy
- Sound

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