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It is currently Sun Sep 24, 2017 8:40 am


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messy
Post  Post subject: i want to learn factoring polynomial equation  |  Posted: Thu Apr 20, 2017 4:01 pm

Joined: Thu Sep 29, 2016 6:16 pm
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can somebody explain this step in detail ?


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gbalkam
Post  Post subject: Re: i want to learn factoring polynomial equation  |  Posted: Fri Jul 14, 2017 7:50 pm
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Joined: Sun Sep 25, 2016 8:19 pm
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(2x+3)(3x+5) is actually the same as (2x+3) multiplied by (3x+5) = (6x +15)

Remember in this case (2x+3) is not an equation, it is a value (solution to an equation) since you cant multiply apples time oranges, you would state Apple Apple (2x)+5 oranges
when you consider it in this manner it becomes easy...
3apples x 2 apples = 6 apples
+(5 times 3 oranges) (15 oranges) so...
(6x+15)

Hopefully I remembered that correctly. I haven't used that in about 40 years. LOL


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Olinguito
Post  Post subject:   |  Posted: Mon Jul 17, 2017 9:26 pm
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gbalkam wrote:
(2x+3)(3x+5) is actually the same as (2x+3) multiplied by (3x+5) = (6x +15)
That is wrong. It should be:

    $ \displaystyle \begin{array}{rcl}(2x+3)(3x+5) &=& (2x)(3x+5)+3(3x+5) \\ {} &=& 6x^2+10x+9x+15 \\ {} &=& 6x^2+19x+15\end{array}$

gbalkam wrote:
Remember in this case (2x+3) is not an equation, it is a value (solution to an equation)
It's neither an equation nor a solution. What it is is an expression involving the unknown x.

gbalkam wrote:
Hopefully I remembered that correctly.
Nope.

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iNow
Post  Post subject: Re: i want to learn factoring polynomial equation  |  Posted: Mon Jul 17, 2017 10:08 pm
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Appreciate your correction, Olinguito, and also thanks to gbalkam for trying to help the OP which hadn't received a response despite being posted months ago

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