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mlddmlnog Group Title

Calculus. Help. :'(

  • one year ago
  • one year ago

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  1. mlddmlnog Group Title
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    for what non-negative valuof b is the line given by \[y=-\frac{ 1 }{ 3 }x+b\] perpendicular to the curve y=x^3?

    • one year ago
  2. UnkleRhaukus Group Title
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    take the derivative (with respect to x) of both equations , what do you get?

    • one year ago
  3. mlddmlnog Group Title
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    i got.. y'=-1/3+b and y'=3x^2 ..

    • one year ago
  4. mlddmlnog Group Title
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    waht do you do next?

    • one year ago
  5. UnkleRhaukus Group Title
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    try the derivative of the first equation again ( you made a mistake)

    • one year ago
  6. mlddmlnog Group Title
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    hm... i can't seem to find what my mistake was.. :/ is it the +b part??? because I do not know what to do with that...

    • one year ago
  7. UnkleRhaukus Group Title
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    b is really bx^0

    • one year ago
  8. mlddmlnog Group Title
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    so then, it would just be y'=-1/3???

    • one year ago
  9. UnkleRhaukus Group Title
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    thats better

    • one year ago
  10. UnkleRhaukus Group Title
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    so you have found the first derivatives of the those lines, the first derivative is the slope of the line

    • one year ago
  11. UnkleRhaukus Group Title
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    the product of the slopes of perpendicular lines is -1

    • one year ago
  12. mlddmlnog Group Title
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    yes.. uhm.. give me a few min to think please :)

    • one year ago
  13. UnkleRhaukus Group Title
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    sure,

    • one year ago
  14. mlddmlnog Group Title
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    ah, i'm struggling.. please help

    • one year ago
  15. UnkleRhaukus Group Title
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    ok , so \[m_1\times m_2=-1\] \[m_1=-\frac13\qquad\qquad m_2=3x^2\] solve for x

    • one year ago
  16. mlddmlnog Group Title
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    x=+1 or -1 .

    • one year ago
  17. UnkleRhaukus Group Title
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    good

    • one year ago
  18. UnkleRhaukus Group Title
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    now set \[y_1=y_2\] take the first case (x=-1) and find b

    • one year ago
  19. UnkleRhaukus Group Title
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    does that make sense?

    • one year ago
  20. mlddmlnog Group Title
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    yes it does :) sorry. open study was being so slow .but i get it now. thank you! :)

    • one year ago
  21. UnkleRhaukus Group Title
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    what did you you get for an answer/

    • one year ago
  22. mlddmlnog Group Title
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    no what do i do..?

    • one year ago
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is replying to Can someone tell me what button the professor is hitting...

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