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anonymous
 one year ago
Pedro has created the function f(x) = 4x  3

2 to represent the number of assignments he has completed, where x represents the number of weeks in the corse. Pedro discovers that, using the inverse function to solve for x = 30, he can predict when he will have 30 assignments completed. Explain to Pedro how to accomplish this, using complete sentences.
anonymous
 one year ago
Pedro has created the function f(x) = 4x  3  2 to represent the number of assignments he has completed, where x represents the number of weeks in the corse. Pedro discovers that, using the inverse function to solve for x = 30, he can predict when he will have 30 assignments completed. Explain to Pedro how to accomplish this, using complete sentences.

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@PeterPan Here it is genius :P

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Essays? But that's so boring _

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Tell me about it _ Thankfully there were only 3, this is my last one.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Okay, I'm not a good speaker, so I'll give you the gist of it and leave it to you to turn a few sentences into a bloody novel so are you ready? :D

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0To get the inverse of a function Like f(x) = 4x  16 for instance

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0If it wasn't an inverse problem I could do it but I don't understand how to solve inverse problems.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0haha You'll never be able to explain it to Pedro (that's Spanish for Peter, right? : ) if you don't know it yourself :P So let me show you an example:

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I have no idea, probably though. Good point, okay.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Sorry about that, internet in the second star could be a bit iffy at times haha Getting the inverse of a function is easy enough in theory, even though it's not always so in practice. Thankfully, linear equations are always easy. So... \[\large f(x) = 4x  16\] First step and this is optional, but I always do it (in my head at least) to make things look nicer, and that's to replace f(x) with y \[\large \color{red}{y} = 4x16\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes. And then you do it again but with x so it's x = 4y  16, right?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0That's right :D But you're going to have to say that properly, though, and clearly (unlike that idiot who wrote that video game problem from last time ugh) So say that you will switch x and y. \[\large \color{blue}x = 4\color{blue}y  16 \]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0lol Then you add 16 to both sides?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So it should look like... dw:1441987136393:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@texaschic101 Can you help me please? The person who was helping me is having internet problems ._.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I have a name, you know :P

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Well I don't know it :P

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0It's Kurt haha Anyway, you did it correctly, just one more final touch ^^

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0You replaced f(x) with y. Now we replace y. With... \[\Large f^{1}(x) = \frac{x+16}{4}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Hey... Are you still there?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yeah sorry. I accidentally closed the tab. Okay, that makes sense... Now how do I put it into the problem that they gave me?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Just do the same, and use Pedro's bloody function :D

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Okay so... f(x) =4x  3/2 y = 4x  3 / 2 x = 4y  3 / 2 then add 3 to each side?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Nope, not quite. \[\Large x = \frac{4y3}2\] You kind of have to get rid of that 2 in the bottom, first. Try multiplying both sides by 2.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So we would cancel out the 2 all together?

terenzreignz
 one year ago
Best ResponseYou've already chosen the best response.1Yup, while multiplying the left x with a 2. HAHA account back to normal... I feel more formal already (even though I'm not LOL)

terenzreignz
 one year ago
Best ResponseYou've already chosen the best response.1\[\Large \color{red}2\cdot x = \frac{4y3}2\cdot \color{blue}2\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I'm lost .. It's harder when it's already in a fraction.

terenzreignz
 one year ago
Best ResponseYou've already chosen the best response.1You're lost? I thought your name was Hayley :D HAHA Don't be afraid of fractions, they're just numbers trying to look tough ^^ In fact, multiplying the 2 get rid of the fraction bar: \[\Large 2x = \frac{4y3}{\cancel{2}}\cdot \cancel{2}\]\[\Large 2x = 4y  3\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yeah yeah, whatever :P lol Okay... how do you ride of the 4 in the y? Don't we need a variable all by itself?

terenzreignz
 one year ago
Best ResponseYou've already chosen the best response.1Sshh... One at a time, Miss lost. First, your original idea. We add three to both sides to remove that 3. We couldn't do it earlier because, well, there was a denominator. But now there isn't. So... add the 3 and you get...?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0OH OH, I got it now!! So... dw:1441989280403:dw

terenzreignz
 one year ago
Best ResponseYou've already chosen the best response.1And the final touch \[\Large f^{1}(x) = \frac{2x + 3}4\] and Pedro can stick that up his... well, wherever he does his maths HAHA Well done! Amazing Grace!! HAHA You once... were lost... but now... you're... well, something Good job ^^

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yay! Thank you so much. You are a life saver... well grade saver I guess ^.^

terenzreignz
 one year ago
Best ResponseYou've already chosen the best response.1No problem. ^_^ I am like super smart, after all... AHAHAHAHA or maybe just a little :)
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