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Mathematics 8 Online
OpenStudy (anonymous):

Find the product of (3x - 4)(2x2 + 2x - 1)

OpenStudy (anonymous):

First distribute the 3x to the terms in the second polynomial.

OpenStudy (snowfire):

Distribute the 3x-4 to every term. (3x-4)2x^2+(3x-4)2x-(3x-4)

OpenStudy (anonymous):

Then, distribute the -4 to the terms in the second polynomial.

OpenStudy (anonymous):

Combine the terms to make the answer.

OpenStudy (snowfire):

Make sure you take care when dealing with the negatives. But let me do the first set for you. (3x-4)2x^2= 6x^3-8x^2

OpenStudy (snowfire):

Does that make sense?

OpenStudy (anonymous):

No

OpenStudy (anonymous):

Which one is it then? 6x3 + 2x2 - 5x + 4 6x3 + 14x2 - 11x + 4 6x3 - 14x2 - 5x + 4 6x3 - 2x2 - 11x + 4

OpenStudy (snowfire):

You "distribute" the 3x-4 to each term. So you give each of the terms inside a copy of (3x-4). Now you only need to work with one term at a time. I did the first term for you, but you said it didn't make sense. Multiply the 2x^2 by 3x, then add it to -4*2x^2.

OpenStudy (anonymous):

Which one is it then? 6x3 + 2x2 - 5x + 4 6x3 + 14x2 - 11x + 4 6x3 - 14x2 - 5x + 4 6x3 - 2x2 - 11x + 4

OpenStudy (snowfire):

I don't believe in giving out answers. You should understand it so you can do it again on your own.

OpenStudy (snowfire):

So now, try the second term, (3x-4)2x

OpenStudy (disco619):

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