Ikou
  • Ikou
Can someone help me out please? I need to find out how I can the x-intercepts of the function C(x)=x^2+5x+6
Mathematics
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
set it equal to zero and solve for \(x\)
Ikou
  • Ikou
could someone show me how thats done exactly?
Ikou
  • Ikou
I got six but I'm supposed to explain how I got it do I just put in the steps I did?

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More answers

anonymous
  • anonymous
\[x^2+5x+6=0\] is a start
anonymous
  • anonymous
this one factors so it is not too bad otherwise you need the quadratic formula
anonymous
  • anonymous
btw it is not 6 for sure you wil get two answers, neither are 6
Ikou
  • Ikou
Hm, should I add 5x to x^2?
Ikou
  • Ikou
oh wait
Ikou
  • Ikou
got that totally wrong, I get two x's x=-3 and x=-2
anonymous
  • anonymous
no they are not like tersm, you cannot add them you have to factor this \[(x+a)(x+b)=0\]
Ikou
  • Ikou
right?
anonymous
  • anonymous
bingo
Ikou
  • Ikou
Okai, and if its not too much, how could I construct a rough graph of it? The question I'm on really sucks. Its like "Describe how to construct a rough graph of C(x) so that the meteorologist can predict when there will be no change in the water vapor."...
anonymous
  • anonymous
it is a quadratic, meaning the shape will be a parabola since the leading coefficient is positive, ( it is 1) the parabola will open up it crosses the x axis at the two numbers you found \((-3,0)\) and \((-2,0)\)
anonymous
  • anonymous
you want a nice picture, it will look something like this http://www.wolframalpha.com/input/?i=x^2%2B5x%2B6
anonymous
  • anonymous
you can see where it crosses the x axis
Ikou
  • Ikou
Yeah i see
Ikou
  • Ikou
So is this all I need to answer this?
Ikou
  • Ikou
@satellite73

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