anonymous
  • anonymous
can any one help me with this X^3-7X-9=0
Mathematics
katieb
  • katieb
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immanuelv
  • immanuelv
X~3.14092
anonymous
  • anonymous
u can solve this by trial and improvement i root lies between 3 and 4 because f(3) = 27 -21-9 = -3 and f(4) = 64 -27 -9 = 28 try f(3.1) f(3.2) to get closer to the true root a graph of the function will tell u how many real roots there are - could be only 1 or matbe 3
anonymous
  • anonymous
of course if u have agraphical calculator u can use that

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anonymous
  • anonymous
ok ....thanks much

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