anonymous
  • anonymous
Let f(x) = 5x + 12. Find f^-1(x). I got x-2/5 x minus 2 over the quantity 5.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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misty1212
  • misty1212
HI!!
anonymous
  • anonymous
Hello. o:
misty1212
  • misty1212
function says ''multiply by 5, add 12"

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misty1212
  • misty1212
inverse says "subtract 12, divide by 5"
anonymous
  • anonymous
Supposed to do the inverse, so I did. Lemme screenshot.
misty1212
  • misty1212
you wrote \[\frac{x-2}{5}\] but i bet you meant \[\frac{x-12}{5}\] since there is not 2 in it
misty1212
  • misty1212
no i got it you got it too i think
anonymous
  • anonymous
Yeah I got that. xD I forgot the 1 to make it 12. Here's le work. http://prntscr.com/8ysskd
anonymous
  • anonymous
I wrote two and from there I thought it was, derp. xD
misty1212
  • misty1212
man is that a bad mistake (not yours, the screen shot)
misty1212
  • misty1212
where did that come from?
anonymous
  • anonymous
I used a program called lightshot to take screenshots. Helpful little thing, really.
misty1212
  • misty1212
lol no dear i dont mean the screenshot itself i mean who wrote it?
misty1212
  • misty1212
does it come from a text? your teacher? on line system?
anonymous
  • anonymous
Oh, someone on Brainly. I wrote the same thing, oh wow that's the wrong screenshot. XD That was for another question I worked out. I like making sure I do everything perfectly because math is my weakpoint. When I come here it's to make sure I understand everything to its fullest. Right now functions are my weakest point, but I work them out on my own then come here to see if I'm right.
anonymous
  • anonymous
Most people come here for answers, I rather be taught so I can do it on my own. I can't trust any answers I find on the web, they may be wrong, so if I learn it by someone here, then woohoo, I can make sure I got it down pat.
misty1212
  • misty1212
ok i don't mean to be critical but there is a huge mistake there
anonymous
  • anonymous
Where? The screenshot?
misty1212
  • misty1212
\[f(x)=x^2-81\] is not a one to one function it is a parabola and doesn't pass the horizontal line test for example \[f(10)=-19=f(-10)\]
anonymous
  • anonymous
I got \[\frac{ x-12 }{ 5 }\]
misty1212
  • misty1212
when you solve you should get \[\pm\sqrt{x+81}\]
misty1212
  • misty1212
yeah that is right, i am talking about the screen shot
anonymous
  • anonymous
That's what I got. It should have two answers because of the square root thing so the = and - are there. Where's the mistake?
anonymous
  • anonymous
+ and -*
misty1212
  • misty1212
i didn't see it in the screen shot is all
anonymous
  • anonymous
Ah. Thanks!
misty1212
  • misty1212
\[\color\magenta\heartsuit\]

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