anonymous
  • anonymous
x intercept for this function
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
\[\huge y=x^3-9x^2+15x+4\]
anonymous
  • anonymous
this is unfactorable?
anonymous
  • anonymous
oh no wait nevermind

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anonymous
  • anonymous
Any particular method they want you to use? Do they specify factoring?
anonymous
  • anonymous
No but isnt that the only way?
anonymous
  • anonymous
Graphing is the easiest.
anonymous
  • anonymous
Graph that bad boy. Look for where it crosses the x axis. Doneso.
anonymous
  • anonymous
no i have to use an algebraic method
anonymous
  • anonymous
because like say on an exam, i cant graph that
Mertsj
  • Mertsj
Possible rational roots are :
anonymous
  • anonymous
Okay then your best best is to use the rational root theorem to list possible rational roots. Then check each one to see if it is a valid root.
Mertsj
  • Mertsj
\[\pm1,\pm4,\pm2\]
Mertsj
  • Mertsj
Use synthetic division to see if any of those are actual roots.
anonymous
  • anonymous
Mertsj is correct. The way he got those possible roots is: A: Make a list of factors for the last number (In this case, it's 4) B: Make a list of factors for the first coefficient (In this case, it's 1) Possible rational roots must be of the form \(\huge \frac{\text{things in the first list}}{\text{things in the second list}}\)
Mertsj
  • Mertsj
It is not factorable.
Mertsj
  • Mertsj
So the best approach would be to find where y changes sign. Then you would know there is a root between those two values and you could hone in on it by trial and error. Of if you know calculus, you could use the derivative. What class is this for?
anonymous
  • anonymous
@Mertsj calculus !
anonymous
  • anonymous
they want you to bruteforce using newton's more than likely

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