If , find u .
My working :
From the result , i can see that it uses this formula
, so r exists.
By comparing , i got x=6 , and thus the answer is 6r-1 .
I just want to know if there is a simpler approach to questions like this .
Thanks .
If , find u .
My working :
From the result , i can see that it uses this formula
, so r exists.
By comparing , i got x=6 , and thus the answer is 6r-1 .
I just want to know if there is a simpler approach to questions like this .
Thanks .
Hello, mathaddict!
If , find
Like you, I saw that the function is linear: .
That is, we have: .
Then: .
Knowing some summation formulas, we have: .
. . which simplifies to: .
Equating coefficients, we have: .
. . Solve the system and get: .
Therefore: .