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Mathematics 19 Online
OpenStudy (anonymous):

Help!!

OpenStudy (anonymous):

OpenStudy (anonymous):

@freckles

OpenStudy (freckles):

I would first apply the law: \[(b^{q}x^{r}y^{s})^n=b^{q \cdot n}x^{r \cdot n} y^{s \cdot n }\]

OpenStudy (freckles):

we see we can apply this law in both numerator and denominator

OpenStudy (anonymous):

I did. my answer was 1/x^3

OpenStudy (freckles):

actually that is kinda close

OpenStudy (freckles):

let's look at just the x part \[\frac{(x^2)^3}{(x)^{-9}}\]

OpenStudy (freckles):

what do you get on top? and on bottom?

OpenStudy (anonymous):

x^6/x^-9

OpenStudy (freckles):

ok and what can you do with negative exponents

OpenStudy (freckles):

like the law is that you can do this: \[\frac{1}{x^{-n}}=x^{n} \text{ right ? }\]

OpenStudy (anonymous):

And thats how i got x^3.

OpenStudy (freckles):

or you can even apply quotient rule your answer still is off

OpenStudy (anonymous):

Oh, so is it x^15?

OpenStudy (freckles):

yes! :)

OpenStudy (freckles):

\[x^{6} x^{9} \text{ since we brought that factor \to the \top }\]

OpenStudy (freckles):

and 6+9 as you say is 15 so you have x^(15)

OpenStudy (anonymous):

Y is canceled out right?

OpenStudy (freckles):

o\[\frac{x^6}{x^{-9}} =x^{6-(-9)}=x^{6+9}\]r quotient rule

OpenStudy (freckles):

we can also look at that part if you wish \[\frac{(y^{-3})^3}{(y)^{-9}}\]

OpenStudy (freckles):

we know that first law I mentioned we can apply to the top which means the top is going to be ?

OpenStudy (anonymous):

y^-9

OpenStudy (freckles):

\[\frac{(y^{-3})^3}{(y)^{-9}}=\frac{y^{-9}}{y^{-9}}=1 \] definitely cancels in your fraction then

OpenStudy (freckles):

so does the constant part \[\frac{(3)^3}{27}=\frac{27}{27}=1\]

OpenStudy (anonymous):

Thanks! You just got a new fan! So btw, all i have to enter is x^15 right. or should i enter 1/x^15

OpenStudy (freckles):

definitely x^(15) recall that we had \[\frac{(x^2)^3}{x^{-9}}=\frac{x^6}{x^{-9}}=x^{6-(-9)}=x^{6+9}=x^{15}\]

OpenStudy (anonymous):

Alright great. :) Thanks a bunch!

OpenStudy (freckles):

np

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