anonymous
  • anonymous
Check my answers again Lol please Find the number of real number solutions for the equation. x^2-15=0 1 0 2 - my answer Can not be determined from the graph
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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dinamix
  • dinamix
are u sure its x^2-15=0 o.O ?
anonymous
  • anonymous
Use the quadratic formula to solve the equation. If necessary, round to the nearest hundredth. A rocket is launched from atop a 101-foot cliff with an initial velocity of 116 ft/s. a. Substitute the values into the vertical motion formula h = -16t^2 + vt + c. Let h = 0 b. Use the quadratic formula find out how long the rocket will take to hit the ground after it is launched. Round to the nearest tenth of a second. A) 0 = -16t^2+101t+116; 8s B) 0 = -16t^2+116t+101; 0.8s - my answer C) 0 = -16t^2+101t+116; 0.8s D) 0 = -16t^2+116t+101; 8s
phi
  • phi
\[ x^2-15=0 \\ x^2= 15 \\ x= \pm \sqrt{15} \] you would not get real number solutions if you had to take the square root of -15 but here, you have two real numbers.

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anonymous
  • anonymous
wait a min let me recheck
anonymous
  • anonymous
Yeah @dinamix
dinamix
  • dinamix
cuz i find answer like @phi
phi
  • phi
you have the correct equation, but if we used t=1 (which is close to t=0.8) we get -16+116+101 which is not close to zero (we want height = 0 when on the ground)
anonymous
  • anonymous
I don't get it, are my answers wrong..
anonymous
  • anonymous
can you help me @ASAAD123
anonymous
  • anonymous
@pooja195
anonymous
  • anonymous
and one more question Use any method to solve the equation. If necessary, round to the nearest hundredth. 7x^2-16x=8 0.42, –2.71- my answer 35.43, –33.14 5.42, –2.95 2.71, –0.42
anonymous
  • anonymous
the first one is correct. The equation is correct for the second one. The solution isn't. The third one is wrong
anonymous
  • anonymous
I wasn't sure.. for the second one I was like either B or C are both wrong.. if not B then C, not sure tho @peachpi
anonymous
  • anonymous
the equation you selected is the right one, but 0.8 isn't a solution to it. Check to see that you plugged the numbers into the quadratic equation correctly.
anonymous
  • anonymous
the third one is it D?
anonymous
  • anonymous
@peachpi
anonymous
  • anonymous
@Luigi0210
anonymous
  • anonymous
Can someone helpp meee
anonymous
  • anonymous
which question?
anonymous
  • anonymous
and one more question Use any method to solve the equation. If necessary, round to the nearest hundredth. 7x^2-16x=8 0.42, –2.71- my answer 35.43, –33.14 5.42, –2.95 2.71, –0.42 - my answer
anonymous
  • anonymous
D
anonymous
  • anonymous
not A
anonymous
  • anonymous
so we are trying to find solution to \[7x^{2}-16x=8\] ?
anonymous
  • anonymous
so which method did you use to solve this question?
anonymous
  • anonymous
you could use, graphical methods, quadratic formula, etc..
anonymous
  • anonymous
yes D

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