anonymous
  • anonymous
Using graphing technology, approximate where the graph of y = 5x2 − 3x − 9 crosses the x-axis. (1.55, 0) and (−1.15, 0) (1.23, 0) and (−1.26, 0) (1.32, 0) and (−1.01, 0) (1.68, 0) and (−1.08, 0)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
agreene
  • agreene
http://www4b.wolframalpha.com/Calculate/MSP/MSP36651a0ih2e3e00ef77c00001h1b699b9c870593?MSPStoreType=image/gif&s=57&w=399&h=185&cdf=RangeControl
anonymous
  • anonymous
Quadratic formula... a=5 b=-3 c=-9 Plug them in and you'll get two answers for x. Both y-values will be 0.
anonymous
  • anonymous
Or do you want me to tell you how to do this on a TI-83/84?

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anonymous
  • anonymous
I have no idea how to do any of these..:/
anonymous
  • anonymous
Do you have a graphing calculator?
anonymous
  • anonymous
Nope...
agreene
  • agreene
the link I put is a picture of the graph--you can use it to do the estimation they are asking for.
anonymous
  • anonymous
http://0.tqn.com/d/create/1/0/i/9/9/-/Quadratic.formula.jpg
anonymous
  • anonymous
a=5 b=-3 c=-9 Plug them in and you'll get two answers for x. Both y-values will be 0.
anonymous
  • anonymous
(-(-3) +/- sqrt((-3)^2 - 4*5*(-9)))/(2*5)
anonymous
  • anonymous
(3 +/- (sqrt(9+180))/10 (3+/- sqrt(189))/10 ***THIS MEANS*** x = (3+ sqrt(189))/10 y=0 x = (3-sqrt(189))/10 y=0 Is this making sense?

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