anonymous
  • anonymous
Help Functions See Attachment
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
anonymous
  • anonymous
I need help with the second part of Graph A
Psymon
  • Psymon
Looks like you just put the wrong inequalities. You reversed which ones you're supposed to do. f(x) < 0 means the function is LESS than 0. f(x) > 0 means the function is GREATER than zero. Not only that, since the question used < >, you dont want to be using \[\le or \ge \]

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anonymous
  • anonymous
so would it be x>4 and x<-4 ?
Psymon
  • Psymon
Well you still want to use 0 and 4 like you were. Its just if f(x) < 0, the function is LESS than 0. And since < was originally used, you use the same symbol. So for that interval, it'd be -4 < x < 0
anonymous
  • anonymous
I put that in and it said it was wrong...
Psymon
  • Psymon
Ah, I see the mistake. \[-4\le x < 0\] Yeah, need to include the -4, my apologies. That would be the one for f(x) < 0
anonymous
  • anonymous
I tried putting that in for f(x) < 0 and it said incorrect....
Psymon
  • Psymon
Okay, yeah, im being an idiot x_x I see the problem, but its whether or not you trust me to explain.
anonymous
  • anonymous
no problem, go ahead
Psymon
  • Psymon
Alright. I'm immediately thinking intervals, which are usually given in terms of x. But since it says f(x) less than 0, I needed to realize it was speaking of y values. So the answers you have on the screenshot appear to be correct except for the fact you cannot include 0, so you must use < sign for 0 on those intervals. f(x) < 0 \[0< x \le 4 \]Because this is where the graph is below the x-axis f(x) > 0 \[-4 \le x < 0 \] Since this is where the graph is above the x-axis. So yeah, just needed to use regular < and > for the 0 part.
anonymous
  • anonymous
okay, thank you @Psymon

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