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About LinkBacksthe roots of (x-41)^49 + (x-49)^41 -(x-2009)^2009 = 0 are
A. All necessarily real
B. non real except three positive real roots
C. non real except one positive real roots
D. non real except for three real roots of which exactly one is positive
the roots of (x-41)^49 + (x-49)^41 -(x-2009)^2009 = 0 are
A. All necessarily real
B. non real except three positive real roots
C. non real except one positive real roots
D. non real except for three real roots of which exactly one is positive
My guess is that the answer is C (only one real root, which is positive), but I don't have a proof of that.Originally Posted by Raj917
LetIf
then the positive term
massively outweighs the other two terms, so that
For
all three terms are positive, so again
At x=2009 the function is increasing. It looks very much as though it then has a single maximum as x increases, after which it decreases monotonically tothereby crossing the x-axis just once and giving rise to the single real root of the function.
I am sure that there must be a more convincing way of attacking this problem. It should presumably take advantage of the fact thatbut I cannot see any way to make use of that fact.
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