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Vijay posted an Question
March 26, 2022 • 02:18 am 30 points
  • IIT JAM
  • Mathematics (MA)

How many real roots does the polynomial 3x° +9x +7 have? (a) 1 (b) 3 (c) 5 (d) 0

How many real roots does the polynomial 3X° +9X +7 have? (a) 1 (b) 3 (c) 5 (d) 0

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  • Abhishek tripathi 1 Best Answer

    let given polynomial is f(x). when we take derivative of f(x) then f'(x)=15x^4 +9 and f'(x) have complex roots which means f'(x)>0 for all x . So f(x) is strictly increasing function which means f(x) have only one root.

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