xLeeChaex 46 Posted October 30, 2014 Share Posted October 30, 2014 I need help with question 17,19,21 Only with Part A because it was the part I got wrong lol EDIT: I need help on 23 as well on Part C only Answer is 0,1/2; (0,-1), (1/2,-1) The answer to 17 is Domain {x|x >0} Range All real numbers 19. Domain All real numbers Range: {y|y ≤ 2} 21. Domain All real numbers Range:{y|y ≥ -3 } But can u guys explain why are these the answer to these questions? I dont get why! Link to comment Share on other sites More sharing options...
Monika 3,152 Posted October 30, 2014 Share Posted October 30, 2014 Oh God if only I could understand... Link to comment Share on other sites More sharing options...
Paruru 2,265 Posted October 30, 2014 Share Posted October 30, 2014 You have problems with understanding the domain? ( so the graph exercise) If that's the problem I might be able to help >< Link to comment Share on other sites More sharing options...
xLeeChaex 46 Posted October 30, 2014 Author Share Posted October 30, 2014 You have problems with understanding the domain? ( so the graph exercise) If that's the problem I might be able to help >< Yes i need help based on the graph exercise as you can see but on top of the page it has Part A,B, and C u have to do but i only need help with Part A with questions 17,19,21 Link to comment Share on other sites More sharing options...
Paruru 2,265 Posted October 30, 2014 Share Posted October 30, 2014 Yes i need help based on the graph exercise as you can see but on top of the page it has Part A,B, and C u have to do but i only need help with Part A with questions 17,19,21 Ok, give me a second to write my explanation down ^^ Link to comment Share on other sites More sharing options...
Rapmon's Ahjussi Husband 2,299 Posted October 30, 2014 Share Posted October 30, 2014 I'm sooooo happy i'm an adult ; f*ck you math!!!!!!!! Link to comment Share on other sites More sharing options...
xLeeChaex 46 Posted October 30, 2014 Author Share Posted October 30, 2014 I'm sooooo happy i'm an adult ; f*ck you math!!!!!!!! U graduated from college?? lol Link to comment Share on other sites More sharing options...
Silktiger 3,227 Posted October 30, 2014 Share Posted October 30, 2014 Ok I'm not sure if this is what you're askingn but for the graph questions part a with the domain and range: Basically the domain is all the x values of the function, and range is the y values. So for example #17 it looks like there's an asymptote at x=0, so you know that the graph will not cross that vertical line. So the x values of the function will be greater than 0. And for the range it's all real numbers because the graph goes on infinitely in the y direction. I'm on my phone right now so it's hard to type but if you need more explanations, pm me ^_^ Link to comment Share on other sites More sharing options...
Rapmon's Ahjussi Husband 2,299 Posted October 30, 2014 Share Posted October 30, 2014 U graduated from college?? lol I'm 36, so yeah ; my thing was literature; enjoy your math hun Ahahahahah !!!!! Link to comment Share on other sites More sharing options...
dream 1,916 Posted October 30, 2014 Share Posted October 30, 2014 23 c would be something like this -1 = 2x² - x - 12x² - x = 0x(2x - 1) = 0x' = 02x - 1 = 0x'' = 1/2 no? Link to comment Share on other sites More sharing options...
AdamJay 579 Posted October 30, 2014 Share Posted October 30, 2014 I'm 36, so yeah ; my thing was literature; enjoy your math hun Ahahahahah !!!!! you're 36? and you asked us to write a you a chanyeol& chen fanfic Link to comment Share on other sites More sharing options...
Paruru 2,265 Posted October 30, 2014 Share Posted October 30, 2014 Exercise 17: Is this somewhat helpfull? I'm not the best when it comes to explaining, but I tried! Link to comment Share on other sites More sharing options...
xLeeChaex 46 Posted October 30, 2014 Author Share Posted October 30, 2014 Exercise 17: Is this somewhat helpfull? I'm not the best when it comes to explaining, but I tried! Yes its a good explanation!!!! Thank u! :DD Link to comment Share on other sites More sharing options...
xLeeChaex 46 Posted October 30, 2014 Author Share Posted October 30, 2014 23 c would be something like this -1 = 2x² - x - 1 2x² - x = 0 x(2x - 1) = 0 x' = 0 2x - 1 = 0 x'' = 1/2 no? Yeah it is but then it says the points are (0,-1) and (1/2,-1) which idk where in the hell they got -1 from .-. Link to comment Share on other sites More sharing options...
Paruru 2,265 Posted October 30, 2014 Share Posted October 30, 2014 Yes its a good explanation!!!! Thank u! :DD You're welcome ^^ Sorry if it's a bit messy though >< Link to comment Share on other sites More sharing options...
Silktiger 3,227 Posted October 30, 2014 Share Posted October 30, 2014 Ok now that I'm back home I shall try to answer question 23 part C! So f(x)=2x2-x-1, right? and it asks you to find x when f(x)= -1. Basically, remember that f(x) is pretty much another way of saying y. So they're asking you what x is when y= -1. To find this, just substitute -1 into the original equation. So it would be -1=2x2-x-1 0=2x2-x 0=x(2x-1) x=0 or 2x-1=0 x=0 or x=1/2 Then, they ask you what the points are. Remember that f(x) (aka y)= -1 So the points would be (0,-1) and (1/2,-1) They got the -1 from the original question. Like how it was asking you to find the x values at f(x)= -1 Or if you wanted to go the long way, you could substitute both values of x back into f(x)=2x2-x-1, and you would get -1 both times. Link to comment Share on other sites More sharing options...
dream 1,916 Posted October 30, 2014 Share Posted October 30, 2014 Yeah it is but then it says the points are (0,-1) and (1/2,-1) which idk where in the hell they got -1 from .-. -1 is the Y value, it was given in the question the funcion is f(x) = 2x² - x - 1 so u replace f(x) with the value given so it goes -1 = 2x² - x - 1 Link to comment Share on other sites More sharing options...
xLeeChaex 46 Posted October 30, 2014 Author Share Posted October 30, 2014 Ok now that I'm back home I shall try to answer question 23 part C! So f(x)=2x2-x-1, right? and it asks you to find x when f(x)= -1. Basically, remember that f(x) is pretty much another way of saying y. So they're asking you what x is when y= -1. To find this, just substitute -1 into the original equation. So it would be -1=2x2-x-1 0=2x2-x 0=x(2x-1) x=0 or 2x-1=0 x=0 or x=1/2 Then, they ask you what the points are. Remember that f(x) (aka y)= -1 So the points would be (0,-1) and (1/2,-1) They got the -1 from the original question. Like how it was asking you to find the x values at f(x)= -1 Wow....i just realized that thank u though! Link to comment Share on other sites More sharing options...
Rapmon's Ahjussi Husband 2,299 Posted October 30, 2014 Share Posted October 30, 2014 you're 36? and you asked us to write a you a chanyeol& chen fanfic IKR! shock !, can u belive anyone dis days aigoooo Link to comment Share on other sites More sharing options...
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