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Factoring the Sum & Difference of Two Cubes. This is a piece of cake, if you have perfect cubes. What are perfect cubes?. This is a piece of cake, if you have perfect cubes. What are perfect cubes? Something times something times something . Where the something is a factor 3 times.

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Presentation Transcript
slide3

This is a piece of cake, if you have perfect cubes.

What are perfect cubes?

Something times something times something.

Where the something is a factor 3 times.

8 is 2  2  2, so 8 is a perfect cube.

x6is x2 x2 x2 so x6 is a perfect cube.

It is easy to see if a variable is a perfect cube, how?

slide4

This is a piece of cake, if you have perfect cubes.

What are perfect cubes?

Something times something times something.

Where the something is a factor 3 times.

8 is 2  2  2, so 8 is a perfect cube.

x6is x2 x2 x2 so x6 is a perfect cube.

It is easy to see if a variable is a perfect cube, how?

See if the exponent is divisible by 3. It’s harder for

integers.

slide5

The sum or difference of two cubes will factor into a

binomial  trinomial.

same sign

always +

always opposite

same sign

always +

always opposite

slide6

Now we know how to get the signs, let’s work on

what goes inside.

Square this term to get this term.

Cube root of 1st term

Cube root of 2nd term

Product of cube root of 1st term

and cube root of 2nd term.

slide7

Try one.

Make a binomial and a trinomial

with the correct signs.

slide8

Try one.

Cube root of 1st term

Cube root of 2nd term

slide9

Try one.

Square this term to get this term.

slide10

Try one.

Multiply 3x an 5 to get this term.

slide11

Try one.

Square this term to get this term.

slide12

Try one.

You did it!

Don’t forget the first rule of factoring is to look

for the greatest common factor.

I hope you took notes!