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Mathematics 23 Online
OpenStudy (anonymous):

Divide

OpenStudy (anonymous):

OpenStudy (anonymous):

just flip the values at the bottom then multiply it

OpenStudy (anonymous):

can you show me how

OpenStudy (anonymous):

|dw:1338396312892:dw|goin to to be looking like this:

OpenStudy (anonymous):

then what do yuo do

OpenStudy (anonymous):

easy the opp of div is multiplication

OpenStudy (anonymous):

can you show me again

OpenStudy (ash2326):

@summerd are you here?

OpenStudy (anonymous):

yesi am here

OpenStudy (ash2326):

\[\large \frac{\frac{x^2+2x+1}{x-2}}{\frac{x^2-1}{x^2-4}}\] Now this division can be converted to multiplication by flipping the denominator \[\large \frac{x^2+2x+1}{x-2}\times {\frac{x^2-4}{x^2-1}}\] Do you get this?

OpenStudy (anonymous):

ya then what do yuo do

OpenStudy (anonymous):

@ash2326 what do you do next

OpenStudy (ash2326):

Now let's factor each of the terms Do you know these? \[(a+b)^2=a^2+2ab+b^2\]\[(a^2-b^2)=(a+b)(a-b)\]

OpenStudy (anonymous):

ya

OpenStudy (ash2326):

Use these to factor the terms :)

OpenStudy (anonymous):

can you show me how

OpenStudy (ash2326):

\[\large \frac{x^2+2x+1}{x-2}\times {\frac{x^2-4}{x^2-1}}\] We notice that \[x^2+2x+1=(x+1)^2\] Do you agree with this?

OpenStudy (anonymous):

yes i agree

OpenStudy (ash2326):

and \[x^2-4=(x+2)(x-2)\] now factor the terms left if they could be factored and then post what do you get

OpenStudy (anonymous):

so factor\[ x{2}-4\]

OpenStudy (ash2326):

\[\large \frac{(x+1)^2}{x-2}\times {\frac{(x+2)(x-2)}{x^2-1}}\] now factor \(x^2-1\)?

OpenStudy (anonymous):

how

OpenStudy (ash2326):

Use the formula \[(a^2-b^2)=(a+b)(a-b)\] here we have \[x^2-1=x^2-1^2\]

OpenStudy (anonymous):

and that is the answer oro can you simplify the x to the second

OpenStudy (ash2326):

we'll get to the answer, could you factor this? x^2-1

OpenStudy (anonymous):

how to you factor it

OpenStudy (ash2326):

@summerd If we have the form \[(a^2-b^2)\ \text {We factor it as}\ (a+b)(a-b)\] Now you try factoring it?

OpenStudy (anonymous):

|dw:1338398881808:dw|

OpenStudy (ash2326):

Yeah you're right:D

OpenStudy (anonymous):

so then what do we do

OpenStudy (ash2326):

\[\large \frac{(x+1)^2}{x-2}\times {\frac{(x+2)(x-2)}{(x-1)(x+1)}}\] Can you simplify it by cancelling the common terms?

OpenStudy (anonymous):

can you show me again

OpenStudy (ash2326):

\[\large \frac{(x+1)^2}{\cancel {x-2}}\times {\frac{(x+2)\cancel{(x-2)}}{(x-1)(x+1)}}\] Now cancel other terms like this?

OpenStudy (anonymous):

what else do you do can you show me it is hard to draw it

OpenStudy (anonymous):

what else do you do can you show me it is hard to draw it

OpenStudy (ash2326):

Ok don't draw, do you see any other common terms in numerator and denominator?

OpenStudy (anonymous):

x+1

OpenStudy (ash2326):

Yeah so we'll get \[\large {(x+1)^\cancel 2}\times {\frac{(x+2)}{(x-1)\cancel{(x+1)}}}\] Tell what's the answer? just type here, don't draw

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