anonymous
  • anonymous
x intercepts
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
whats the question your asking
anonymous
  • anonymous
identify the x-intercepts in the graph y = 3x2 + 19x – 40..sorry connection was slow
anonymous
  • anonymous
The Def'n of the x-intercept is the points where the y-value is zero. So set y to 0 and solve for x

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precal
  • precal
use the quadratic formula
jennychan12
  • jennychan12
quadratic formula: \[x = \frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]
anonymous
  • anonymous
Quadratic formula for 0 = ax^2 + bx + c\[x= {-b \pm \sqrt{b^2-4ac} \over 2a}\]
anonymous
  • anonymous
thank you guys.. but how do I do that?
precal
  • precal
are you studying algebra 1 or 2?
anonymous
  • anonymous
2
precal
  • precal
|dw:1357172313426:dw|just sub into formula and use order of operation to evaluate it
anonymous
  • anonymous
This can also be factored if you are well versed at factoring
precal
  • precal
you could also, find the roots by looking at the graph of the function
anonymous
  • anonymous
thankyou precal. (:
anonymous
  • anonymous
\[0=3x^2 + 19x – 40\]\[0=(3x-5)(x+8)\]
precal
  • precal
you have many choices for finding the solution, if you plan to study math beyond algebra 2 learn to factor (but not everything can be factored), learn to use the quadratic formula (works 100% of the time)
anonymous
  • anonymous
im horrible in math, so after alg 2 i will be done with it :P
precal
  • precal
everything in math (no matter the power) gets written to the 1st power or the 2nd power, so learn to solve those
precal
  • precal
what will you do in the future? future goals?
precal
  • precal
|dw:1357172585393:dw|
anonymous
  • anonymous
im going to own a buisness but i already everything i would need too know. its not going to be huge or complex..just a simple small town business
precal
  • precal
|dw:1357172654731:dw|
precal
  • precal
|dw:1357172718818:dw|
precal
  • precal
well math teaches us to be patient and to pay attention to details
precal
  • precal
in business, you will care about maximizing your profit and minimizing your cost all big businesses started small and grew higher math helps you expand your business watch shark tank, pay attention to when they talk about numbers many people do not get funding because they do not know their numbers some good ideas were passed up by the sharks some bad ideas were given money because the people knew their numbers good luck don't give up on math yet
anonymous
  • anonymous
im givin different answers on this question. im confused which one is wrong or right?
precal
  • precal
Solutions are the same x=-8 and x=5/3 I just showed that if you use the quadratic formula or factoring, you will get the same solutions.
anonymous
  • anonymous
I wont give up on math, i mean as I have to use it ill start to learn it..in real life situations i guess. and ooohhkk. thankyou (:
precal
  • precal
yw

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