How to differentiate for critical points with variable in denominator sorry for posting a particula

Aaden Booth

Aaden Booth

Answered question

2022-06-01

How to differentiate for critical points with variable in denominator
sorry for posting a particular problem, this is maybe more of an algebra problem than a calculus problem, but it does involve differentiating so I thought I would state the problem as one. I am currently running through the openOnlineMIT multivariable calculus course. I have ran into a problem which I can't seem to come to the solution. Specifically I am trying to find d d t 4 1 + t 2 + ( 1.5 t 2 ) 2 = 0 When I set this to zero I get 1 t ( 1 t 2 ) = 0. What I can't seem to understand how to solve the algebra. The answers given is 4 t ( t 2 1 ) = 0. which is a bit different but is solvable.

Answer & Explanation

Adyson Gamble

Adyson Gamble

Beginner2022-06-02Added 1 answers

We have
d d t ( 4 1 + t 2 + ( 1.5 t 2 ) 2 ) = 16 t 3 16 t ( t 4 2 t 2 + 3.25 ) 2
This is zero only when
16 t 3 16 t = 0
16 t ( t 2 1 ) = 0
Which is basically the answer you were given.
Did you make a mistake in taking the derivative?

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