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Find \(c\) such that the polynomial (has a degree of 3) \(f(x)+cg(x)\)

 Dec 9, 2020
 #1
avatar+31693 
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For f(x) + c*g(x) to have degree 3, the order 4 terms must vanish.  So

 

5x4 + c*9x4 = 0

 

Can you take it from here?

 Dec 9, 2020
 #2
avatar+467 
+1

sorry nut I still can not solve it

 Dec 9, 2020

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