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Mathematics 21 Online
OpenStudy (sleepyjess):

@astrophysics

OpenStudy (sleepyjess):

\(4x^{2/3} - 3x^{1/3} - 1 = 0\)

OpenStudy (sleepyjess):

I have to find the solutions by factoring

OpenStudy (sleepyjess):

I know so far it's going to be \((x^{1/3} ...)(x^{1/3}...)\), but that's it

OpenStudy (shamim):

Let x^(1/3)=y

OpenStudy (astrophysics):

Yes, shamim has the right idea :)

OpenStudy (sleepyjess):

How would I do that? Put in x^(1/3) where?

OpenStudy (shamim):

U will get ur equation as 4y^2-3y-1=0 Right?

OpenStudy (sleepyjess):

oohhh I see now

OpenStudy (sleepyjess):

but there's not anything that multiplies to -1 and adds to -3...

OpenStudy (shamim):

Happy to help u

OpenStudy (shamim):

-3y=-4y+y Right?

OpenStudy (astrophysics):

You can't do much with this anyways, \[(y-1)(4y+1)=0 \implies (x^{1/3}-1)(4x^{1/3}+1)=0\]

OpenStudy (astrophysics):

Does that make sense? We factored it normally, multiply 4 by -1 getting -4 then what two numbers add up to -3 and -4 which gives 1 and -4 then you can rewrite it as \[4y^2+y-4y-1=0\] yadi yadi yada

OpenStudy (sleepyjess):

Where did -3 come from?

OpenStudy (astrophysics):

Ok let me slow down and use drawing I think this will help |dw:1453430866640:dw|

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