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anonymous

  • one year ago

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

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  1. dinamix
    • one year ago
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    are u sure its x^2-15=0 o.O ?

  2. anonymous
    • one year ago
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    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

  3. phi
    • one year ago
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    \[ x^2-15=0 \\ x^2= 15 \\ x= \pm \sqrt{15} \] you would not get real number solutions if you had to take the square root of -15 but here, you have two real numbers.

  4. anonymous
    • one year ago
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    wait a min let me recheck

  5. anonymous
    • one year ago
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    Yeah @dinamix

  6. dinamix
    • one year ago
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    cuz i find answer like @phi

  7. phi
    • one year ago
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    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)

  8. anonymous
    • one year ago
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    I don't get it, are my answers wrong..

  9. anonymous
    • one year ago
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    can you help me @ASAAD123

  10. anonymous
    • one year ago
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    @pooja195

  11. anonymous
    • one year ago
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    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

  12. anonymous
    • one year ago
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    the first one is correct. The equation is correct for the second one. The solution isn't. The third one is wrong

  13. anonymous
    • one year ago
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    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

  14. anonymous
    • one year ago
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    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.

  15. anonymous
    • one year ago
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    the third one is it D?

  16. anonymous
    • one year ago
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    @peachpi

  17. anonymous
    • one year ago
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    @Luigi0210

  18. anonymous
    • one year ago
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    Can someone helpp meee

  19. anonymous
    • one year ago
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    which question?

  20. anonymous
    • one year ago
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    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

  21. anonymous
    • one year ago
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    D

  22. anonymous
    • one year ago
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    not A

  23. anonymous
    • one year ago
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    so we are trying to find solution to \[7x^{2}-16x=8\] ?

  24. anonymous
    • one year ago
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    so which method did you use to solve this question?

  25. anonymous
    • one year ago
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    you could use, graphical methods, quadratic formula, etc..

  26. anonymous
    • one year ago
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    yes D

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