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Grade: upto college level
        Show that for any real numbers q, the polynomial P(x) = x^7 + x^3 + q , has exactly one real root.
6 years ago

Answers : (1)

Sher Mohammad
IIT Delhi
askIITians Faculty
174 Points
							P'(x)=7x^6+3x^2
P'(x)=0
x^2(7x^4+2)=0, imply x=0
since f'(x)=0 at only x=0 and for any other x f'(x)>0, only one point of inflection possible for p(x) imply exact one root.

Sher Mohammad
B.Tech, IIT Delhi
6 years ago
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