anonymous
  • anonymous
??????? please I have no idea what to do.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
anonymous
  • anonymous
this is a ridiculous question, but the answer is B
anonymous
  • anonymous
why is it ridiculous?

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More answers

anonymous
  • anonymous
because on the right side you are defining the domain, but the domain is definded incorrectly
jhonyy9
  • jhonyy9
- the second answer is right sure
anonymous
  • anonymous
when you define a piecewise function like this \[f(x) = \left\{\begin{array}{rcc} \frac{1}{x}& \text{if} & x \leq 0 \\ 2x& \text{if} & x >0 \end{array} \right. \] a an example, the part after the "if" is defining the domain. but you cannot in my example make x = 0, so what i wrote doesn't make any sense. it has to be \[f(x) = \left\{\begin{array}{rcc} \frac{1}{x}& \text{if} & x < 0 \\ 2x& \text{if} & x >0 \end{array} \right. \]
anonymous
  • anonymous
when you define a function, you define the domain along with it. it is part of the definition so you cannot define a function, define the demain incorrectly, and then ask "what is the domain" the question makes no sense and is completely idiotic. tell those fools at Khan that they do not know what they are doing
anonymous
  • anonymous
so how did you know how to solve it?
anonymous
  • anonymous
because the denominator cannot be 0, so x cannot be 9
anonymous
  • anonymous
would you mind showing me now you solved it?
anonymous
  • anonymous
i am afraid there is nothing really to show
anonymous
  • anonymous
you have a denominator, so you know that it cannot be zero i guess you could write \[\sqrt{x-9}\neq 0\] \[x-9\neq 0\] \[x\neq 9\]
anonymous
  • anonymous
I usually use inequalities when dealing with numbers under the radical sign
anonymous
  • anonymous
i see,yes, but look at how they defined the domain of the function
anonymous
  • anonymous
\[f(x) = \left\{\begin{array}{rcc} \frac{1}{\sqrt{x-9}}& \text{if} & x >9 \\ \frac{1}{\sqrt{9-x}}& \text{if} & x <9 \end{array} \right.\] they have already taken care of where the expression inside the radical should be positive or negative
anonymous
  • anonymous
to be honest with you satellite, i have no idea what this expression is telling me.

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