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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 :)
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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
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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|