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Aug 22nd, 2006, 09:12 AM
#1
Thread Starter
New Member
Urgent Help needed on finding tangent to a curve
Find the the equation of a tangent to the curve where the tangent is at x=1 and the curve is; 4x^3 + 2/x^3 + lnx, i have not come across an equation of this nature before when working out tangents to curves and i am not sure of the method with i could use. i would be very grateful if any assitance could be provided with regards to this question.
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Aug 22nd, 2006, 09:38 AM
#2
Addicted Member
Re: Urgent Help needed on finding tangent to a curve
y = 4x3 + 2x-3 + ln x
dy/dx = 12x2 - 6x-4 + 1/x
Find gradient at x = 1
dy/dx = 12 - 6 + 1 = 7
Find y at x = 1
y = 4 + 2 + ln 1 = 6
So have m = 7, x1 = 1, y1 = 6
Stick into y - y1 = m(x - x1)
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Aug 22nd, 2006, 09:53 AM
#3
Thread Starter
New Member
Re: Urgent Help needed on finding tangent to a curve
thank you yes that is a lot simpler than i made it a rather daft error on my part thank you very much for your assistance
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