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Mathematics 18 Online
OpenStudy (anonymous):

help please

OpenStudy (anonymous):

OpenStudy (bibby):

\[y = x^3-9\] Start by switching the variables and solving for y like so \[x = y^3-9\]

OpenStudy (anonymous):

how would i do that

OpenStudy (bibby):

The same way you do any other problem. Solve for y. start by isolating the y^3. How do you get y^3 on one side?

OpenStudy (anonymous):

subtract?

OpenStudy (bibby):

Lemme rephrase that. How do you get rid of the -9?

OpenStudy (anonymous):

x^3-9 right? is that the answer i tried it again by myself and thats what i got

OpenStudy (bibby):

nope. \[\large x=y^3−9\] add 9 to both sides \[\large x+9=y^3\] how do we get y?

OpenStudy (anonymous):

idk

OpenStudy (bibby):

Roots and powers are opposite \[\large \sqrt[3]{x}^3 = x\] \[\large \sqrt[4]{x}^4 = x\] \[\large \sqrt{x}^2 = x\]

OpenStudy (anonymous):

ok this tells me what?

OpenStudy (bibby):

I don't know. Why don't you try thinking?\[\large \sqrt[3]{y}^3 = y\]

OpenStudy (anonymous):

idk how to do thease

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