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Quad composition (Posted on 2019-03-16) Difficulty: 3 of 5
Let f(x)=x2+10x+20, find the number of real solutions satisfying f(f(f(f(x))))=0

No Solution Yet Submitted by Danish Ahmed Khan    
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re(2): calculator solution | Comment 3 of 4 |
(In reply to re: calculator solution by Charlie)

Well, I don't know what happened before, but now Desmos gives the same graph as the TI calculator. See it here.

Oh! I see the difference is that on the LHS, I didn't include the (x) in the function definitions. It didn't seem to matter for the non-iterated parabola, but did matter for the iterated version.

Edited on March 16, 2019, 2:23 pm
  Posted by Charlie on 2019-03-16 14:19:55

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