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Mathematics 9 Online
OpenStudy (anonymous):

Need help.

OpenStudy (anonymous):

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

cant help did that already and cant remember clearly, ill give you the close but wrong answer sorry

OpenStudy (anonymous):

alright thank u

OpenStudy (solomonzelman):

Okay, can you tell me what does it mean to say \(\Large\color{purple}{ \bf \frac{f(x)}{g(x)} }\) ?

OpenStudy (solomonzelman):

When you have for instance \(\Large\color{green}{ \bf d(x)=2x^{2}-2 }\) and \(\Large\color{red}{ \bf v(x)=x+1 }\) to say \(\Large\color{blue}{ \bf \frac{d(x)}{v(x)} }\) simply means \(\Large\color{blue}{ \bf \frac{ \color{green} { 2x^{2}-2 } }{ \color{red} { x+1 } } }\)

OpenStudy (solomonzelman):

So when you say f/g what does that mean in YOUR case ?

OpenStudy (anonymous):

x/x

OpenStudy (solomonzelman):

Recalling that \(\Large\color{blue}{ \bf f(x)= 3x-6 }\) and \(\Large\color{blue}{ \bf g(x)=x-2 }\) What is \(\Large\color{blue}{ \bf \frac{f}{g} }\) ?

OpenStudy (anonymous):

3x-6 / x-2

OpenStudy (solomonzelman):

Yes. \(\Large\color{blue}{ \bf \frac{~3x-6~}{~x-2~} }\) can you factor the top, and then simplify the fraction ?

OpenStudy (anonymous):

D

OpenStudy (anonymous):

am i wrong? :( @SolomonZelman

OpenStudy (solomonzelman):

First tell me what you get after factoring the top and simplifying the \(\Large\color{blue}{ \bf \frac{~3x-6~}{~x-2~} }\) .

OpenStudy (anonymous):

ok so 6/2 is 3 3x/x is 3 so it will be C

OpenStudy (anonymous):

@SolomonZelman

OpenStudy (solomonzelman):

Yes, the f/g=3. And you are correct there are no domain restrictions. Domain restrictions are only possible when you have 1) A denominator that contains the x, and whatever x-value that makes the denominator equal zero, can not be the domain. (because anything/zero = undefined 2) A square or even root of a negative number is NOT a real number, so if you have \(\LARGE\color{red}{ \bf g(x)= \sqrt[even]{number~-~x} }\) x has to be a value that makes the square root be NOT LESS THAN zero. (or it will be an imaginary number)

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