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# differentiation

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1. y=x^2/ax+b (a, b doesnt = 0)

show that d^2/dx^2 = 2b^2 /(ax+b)^3

i end up with 2a^2x^2 / (ax+b)^3

what have i done wrong??
2. (Original post by Custardcream000)
y=x^2/ax+b (a, b doesnt = 0)

show that d^2/dx^2 = 2b^2 /(ax+b)^3

i end up with 2a^2x^2 / (ax+b)^3

what have i done wrong??
Is that ?
What did you get for ?
3. (Original post by Kvothe the Arcane)
Is that ?
What did you get for ?
dy/dx = -ax^2(ax+b)^-2
4. (Original post by Custardcream000)
dy/dx = -ax^2(ax+b)^-2
That's incorrect. How did you get that?
5. (Original post by Custardcream000)
dy/dx = -ax^2(ax+b)^-2
i know what ive done wrong

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