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Mathematics 20 Online
OpenStudy (anonymous):

factor expression : x^3+ 1/8

OpenStudy (saifoo.khan):

(x + 1/2)^3

OpenStudy (anonymous):

:)

OpenStudy (saifoo.khan):

thnks! :)

OpenStudy (anonymous):

u cube-rooted the 1/8, right?

OpenStudy (saifoo.khan):

Oh yeas!

OpenStudy (anonymous):

mlhuyck: please use wolframalpha.com If you type factor x^3+ 1/8 It will give you the answer.

OpenStudy (anonymous):

aka said 1/2^3?

OpenStudy (anonymous):

i did and it was not right!

OpenStudy (anonymous):

assuming you type it correctly.

OpenStudy (anonymous):

saifoo thats still not right

OpenStudy (saifoo.khan):

Correct gandalfiz

OpenStudy (anonymous):

and i did type it right

OpenStudy (saifoo.khan):

well that it.

OpenStudy (saifoo.khan):

let me type more clearly.

OpenStudy (saifoo.khan):

\[(x + \frac{1}{2} )^3\]

OpenStudy (saifoo.khan):

Now?

OpenStudy (anonymous):

ya

OpenStudy (saifoo.khan):

i knew! :)

OpenStudy (anonymous):

:) you rock

OpenStudy (saifoo.khan):

:D YaY! :D \m/

OpenStudy (anonymous):

Perform the indicated operation. (2x + y)2

OpenStudy (saifoo.khan):

(2x + y)(2x + y)

OpenStudy (saifoo.khan):

multiply them!

OpenStudy (anonymous):

so it would be (4x+y^2)?

OpenStudy (anonymous):

nope

OpenStudy (saifoo.khan):

Nah!

OpenStudy (anonymous):

hellllp

OpenStudy (anonymous):

Foil or distribute them. What is the first term (4x * 4x)

OpenStudy (anonymous):

16x^2

OpenStudy (saifoo.khan):

polpak, its 2x

OpenStudy (anonymous):

correct. Now the inner terms 2x * y

OpenStudy (anonymous):

2xy

OpenStudy (anonymous):

foil: first inner outer last multiply the first terms, multiply the inner terms, multiply the outer terms, multiply the last terms, and add them all together!

OpenStudy (anonymous):

right, and the outer term will be the same. then the last term is y*y

OpenStudy (anonymous):

actually polpak's got u covered. let him/her explain

OpenStudy (anonymous):

So the sum will be 4x^2 + 2xy + 2xy + y^2, and you just need to simplify the middle two terms. Sorry, I mixed up the first terms were 2x * 2x, not 4x*4x

OpenStudy (saifoo.khan):

did u get that?

OpenStudy (anonymous):

polpak how would i write these in that one website you reccommended

OpenStudy (saifoo.khan):

simply write them.

OpenStudy (saifoo.khan):

lol.

OpenStudy (anonymous):

i know but, you try

OpenStudy (saifoo.khan):

try to..?

OpenStudy (anonymous):

like i know how to write it in the box, but it says to type what you want it to do, what do i say? did that make sense?

OpenStudy (saifoo.khan):

simply type this equation directly.

OpenStudy (anonymous):

i did! but it doesnt know what to do unless i type like "factor" or solve before the equation. but for this i need to perform the operation.

OpenStudy (anonymous):

so what do i write BEFORE the equtaion

OpenStudy (saifoo.khan):

i write nothing there/

OpenStudy (saifoo.khan):

excpt the equation itslef.

OpenStudy (anonymous):

i know but it doesnt solve it

OpenStudy (saifoo.khan):

its kindda weird web.

OpenStudy (anonymous):

What? Like that last problem you can type in like this:

OpenStudy (anonymous):

Go to www.wolframalpha.com Type: expand (2x + y)^2 Get answer.

OpenStudy (anonymous):

ahh thank you

OpenStudy (saifoo.khan):

Oh cool.

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