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Mathematics 20 Online
OpenStudy (anonymous):

Using complete sentences, explain how to factor . Be sure that the final factorization (or "answer") is a part of your explanation 2x2 + 13x + 15

OpenStudy (blurbendy):

you need 2x^2 so you can say (2x + ) (x + ) can you fill in the rest?

OpenStudy (anonymous):

How

OpenStudy (blurbendy):

well you need two things to multiply to get 15, and two things to add to get 13x

OpenStudy (blurbendy):

what two things multiply to 15?

OpenStudy (anonymous):

5 and 3

OpenStudy (blurbendy):

now which goes with 2x and which goes with x?

OpenStudy (blurbendy):

to guarantee you get 13

OpenStudy (anonymous):

WHat

OpenStudy (anonymous):

10 AND 3

OpenStudy (blurbendy):

(2x + 5 or 3) (x + 5 or 3) which one will make sure you get 13x

OpenStudy (anonymous):

the first one

OpenStudy (blurbendy):

2x + 5? or 2x + 3?

OpenStudy (anonymous):

2x+3

OpenStudy (blurbendy):

good, so the other one will be (x+5)

OpenStudy (anonymous):

SO the final answer would be (2x+3)(x+5)

OpenStudy (blurbendy):

yes

OpenStudy (anonymous):

But how should i explain how to do this

OpenStudy (blurbendy):

reread what ive said while i helped you. you should be able to explain. (2x + 3)(x +5) if you foil this, you get 2x^2 + 13x + 15

OpenStudy (anonymous):

ok thanks

OpenStudy (blurbendy):

yw

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