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Given that f(x)=5x^2 - 3x + 7 and f(g(x)) = 40 - 11x^2 - 8x^4, find all possible values for the sum of the coefficients in the polynomial function g(x). Thank you to anyone who replies :)

 Sep 11, 2018
 #1
avatar+27908 
+2

Are you sure you have written the equations correctly?  g(x) must be of order 2, so its highest order term is ax2. This means we must have 5a2 = -8   (because 5a2x4 must equal -8x4).  This would make 'a' an imaginary number!

 Sep 12, 2018
 #2
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Hi Alan. Yes, I am sure I wrtoe the question correctly.

 Sep 12, 2018
 #3
avatar+101745 
+1

Alan is right, the leading coefficient of g(x) must be     \(\sqrt{\frac{8}{5}}\;\;i\)      

 

We both think that there is a mistake in the question.  

 Sep 13, 2018

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