How would I go about showing this question: Suppose that the function f : [ 0 ,

Carly Cannon

Carly Cannon

Answered question

2022-07-12

How would I go about showing this question:
Suppose that the function f : [ 0 , 1 ] [ 0 , 1 ] is continuous. Use the Intermediate Value Theorem to prove that there exists c [ 0 , 1 ] such that
f ( c ) = c ( 2 c 2 )

My thoughts are we can define a function say g ( x ) := f ( x ) x ( 2 x 2 ) and then g ( 0 ) = f ( 0 ) and then g ( 1 ) = f ( 1 ) 1 and then I'm stuck on how to complete it to get to the point where
g ( 0 ) < 0 < g ( 1 )
so there would exist a c s.t. g ( c ) = 0 [by IVT] and thus f ( c ) = c ( 2 c 2 )
If anyone could help, would be much appreciated thank you!

Answer & Explanation

Charlize Manning

Charlize Manning

Beginner2022-07-13Added 12 answers

Try to prove instead that g ( 0 ) 0 g ( 1 ).

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