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Mathematics 9 Online
OpenStudy (appleduardo):

whats the derivative of x on the following function: xyz(1-x)(2-y)(3-z)

OpenStudy (freckles):

Do you mean what is the partial derivative to that with respect to x?

OpenStudy (appleduardo):

yes!!

OpenStudy (freckles):

Let me give you a hint Recall the constant multiple rule /[yz(2-y)(3-z) \cdot (x(1-x))_x /]

OpenStudy (freckles):

Then use product rule

OpenStudy (freckles):

\[yz(2-y)(3-z) \cdot (x(1-x))_x \]

OpenStudy (freckles):

So what I'm really saying all you need to do is find the derivative of x(1-x) and put that in the parenthesis and bring down the other stuff in front of ( )

OpenStudy (appleduardo):

so i get: x-x^(2) , and then the partial derivative with respect to x is: x-2x right?

OpenStudy (freckles):

Derivative of x is 1 not x

OpenStudy (appleduardo):

oh you right, then: 1 - x^(2)

OpenStudy (freckles):

So you almost have it m yz(2-y)(3-z)(1-2x) No derivative of x squared is 2x

OpenStudy (appleduardo):

so: 1 - 2x right?

OpenStudy (freckles):

That is what I have above times the other stuff

OpenStudy (freckles):

You might want to review some basic differentiation rules

OpenStudy (appleduardo):

so then i have:\[6xy -12x ^{2}y-2xyz+4x ^{2}yz ^{2}-3y ^{2}x+6x ^{2}y-zy ^{2}x+2x ^{2}yz\]

OpenStudy (appleduardo):

is that the right answer?

OpenStudy (freckles):

I'm not getting that when we multiply the answer out

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