anonymous
  • anonymous
y=x2-14x+44 find the domain and range, and the vertex of the following parabola. Show all work? Help?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
@laughoutloud
laughoutloud
  • laughoutloud
hey do want to know how to do it or just the answer either way doesn't matter to me
anonymous
  • anonymous
Well, everytime I try to solve the vertex my teacher keeps saying its wrong. So I need help with that. Also with the whole domain and range thing.

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More answers

iGreen
  • iGreen
@laughoutloud By the looks of his username, I think he wants to learn how to do it instead of just getting an answer.
anonymous
  • anonymous
Yeah, I'd love to learn how to do it XD
laughoutloud
  • laughoutloud
ok, to find the vertex you need to use the formula \[\frac{ -b }{ 2a }\]
anonymous
  • anonymous
Alright. So do I plug the x^2 into the 2a or the -b?
laughoutloud
  • laughoutloud
that is going to help you find the x value
anonymous
  • anonymous
and the -14 into the -b?
laughoutloud
  • laughoutloud
you plug in \[\frac{ 14 }{ 2 }\]
anonymous
  • anonymous
OK.
anonymous
  • anonymous
That'd make X a 7?
laughoutloud
  • laughoutloud
yes so x = 7 now you have to find the y value.
laughoutloud
  • laughoutloud
What do you think you have to do?
anonymous
  • anonymous
Alright, so I just plug 7 into all the X values
laughoutloud
  • laughoutloud
yes
anonymous
  • anonymous
Okay... Lemme solve it real quick
anonymous
  • anonymous
y=(7)^2 - 14(7) + 44 y = 49 - 98 + 44 y = -49 + 44 y = -5 Is this correct?
laughoutloud
  • laughoutloud
yes, I got the same
laughoutloud
  • laughoutloud
so the vertex is?
anonymous
  • anonymous
So, for the vertex it's (7, -5) right?
laughoutloud
  • laughoutloud
yes
anonymous
  • anonymous
Alright, how do we find the domain / range?
laughoutloud
  • laughoutloud
the domain is going to be all of the x-values when this is graphed do you reach all of the x's eventually its kinda hard to explain
laughoutloud
  • laughoutloud
That probably doesn't make sense
anonymous
  • anonymous
Yeah... That's where I'm confused.
laughoutloud
  • laughoutloud
Ok domain is all real
anonymous
  • anonymous
Okay, sorry to trouble you more about the question... But sense I do all this stuff online and I'm just reading the stuff... How might I find the real numbers to explain to a teacher?
laughoutloud
  • laughoutloud
sorry I'm not very good at explaining @carolinar7
anonymous
  • anonymous
Alright, so.... Can you tell me how you got to your answer perhaps? @laughoutloud?

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