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Tangent Line at Curve

  • #1

Homework Statement


Find the equation of the tangent line at the curve y= x * e^(2x) at the point (2, 2*e^(4))


Homework Equations





The Attempt at a Solution


f'(x)= e^(2x) * (2x+ 1)
(e^4)(5) = 5e^4
y- 2*e^4 = 5*e^4 (x-2)
y= 5(e^4)*x - 8*(e^4)

Is this right? It seems too easy for me to have gotten it right :/ Thanks.
 

Answers and Replies

  • #2
33,639
5,301

Homework Statement


Find the equation of the tangent line at the curve y= x * e^(2x) at the point (2, 2*e^(4))


Homework Equations





The Attempt at a Solution


f'(x)= e^(2x) * (2x+ 1)
(e^4)(5) = 5e^4
To clarify, the above should be
f'(2) = (e^4)(5) = 5e^4
You're finding the slope of the tangent line when x = 2.
y- 2*e^4 = 5*e^4 (x-2)
y= 5(e^4)*x - 8*(e^4)

Is this right? It seems too easy for me to have gotten it right :/ Thanks.
Looks OK.
If you understand the steps involved (find the slope of the tangent, use the point-slope form of the line), it's not very hard.
 
  • #3
Yes sir, that is what I got! Thank you very much.
 
  • #4
33,639
5,301
You're welcome!
 

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