g ( x ) is continuous on [ 1 , 2 ] such that g ( 1 ) = 0 and

Cara Duke

Cara Duke

Answered question

2022-05-21

g ( x ) is continuous on [ 1 , 2 ] such that g ( 1 ) = 0 and
g ( x ) x 2 = 1 g 2 ( x )
Find g ( 2 )
I found that g ( x ) = sin ( c 1 x ) and since g ( 1 ) = 0 shouldn't my c be equal to 1, so that sin ( 1 1 ) = 0.
But when I try for g ( 2 ) with c = 1, I am getting a different answer from the textbook.

Answer & Explanation

Arabella Alvarez

Arabella Alvarez

Beginner2022-05-22Added 8 answers

Your solution, I mean one parameter family of solutions, are correct. Indeed
g ( y ) = sin ( 1 x + c )
Now if we are given g ( 1 ) = 0 so
0 = g ( 1 ) = sin ( 1 1 + c ) = sin ( c 1 )
and then c = 1 + k π ,       k Z . Hence
g ( 2 ) = sin ( 1 / 2 + c ) = sin ( 1 / 2 + k π ) ,       k Z

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