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Posted by on Sunday, March 16, 2014 at 3:54pm.

Use implicit diff. to find dy/dx of each of the following. In the following x,y and (a) are all variables. Show step by step please! Thank you!

1) y^2 = x^2+a^2

2) y^2+ay = x^2+ax+a^2

  • Calculus Help Please!!! - , Sunday, March 16, 2014 at 4:02pm

    2 y dy/dx = 2 x + 2 a da/dx

    y dy/dx = (x+a da/dx)

    dy/dx = (x + a da/dx)/y
    or
    dy/dx = (x + a da/dx)/(x^2+a^2)^.5
    ---------------------------------

    2 y dy/dx + a dy/dx + y da/dx = 2 x^2 + a + x da/dx + 2 a da/dx

    (2y+a)dy/dx = 2 x^2 +a +(x-y+2a)da/dx

    dy/dx = [2 x^2 +a +(x-y+2a)da/dx]/(2y+a)

  • Calculus Help Please!!! - , Sunday, March 16, 2014 at 4:58pm

    I suspect in each, a is a constant, so da/dx=0

  • Calculus Help Please!!! - , Sunday, March 16, 2014 at 5:38pm

    I figured the same but he said specifically that a was variable.

  • Calculus Help Please!!! - , Sunday, March 16, 2014 at 6:01pm

    My answers were like these

    1)
    2yy'=2x+2a

    y'=2x+2a/2y

    2)
    2yy'+ay'+y=2x+a+x+2a-y

    2yy'+ay'=3x+3a-y

    y'(2y+a)=3x+3a-y

    y'=3x+3a-y/2y+a

    And my teacher said I made mistakes with my answers but I couldn't figure out.

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