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ax3 + bx2 + cx + d is a polynomial on real x over real coefficients a, b, c, d wherein a ≠ 0. Which of the following statements is true?
  • a)
    No choice of coefficients can make all roots identical.
  • b)
    a, b, c, d can be chosen to ensure that all roots are complex.
  • c)
    d can be chosen to ensure that x = 0 is a root for any given set a, b , c.
  • d)
    c alone cannot ensure that all roots are real.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
ax3 + bx2 + cx + d is a polynomial on real x over real coefficients a,...
ax3 + bx2 + c x + d =0 ; a ≠ 0
x = 0 is the root for any values of a, b, c only when d = 0.
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Most Upvoted Answer
ax3 + bx2 + cx + d is a polynomial on real x over real coefficients a,...
The given polynomial is ax^3 + bx^2 + cx + d.
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ax3 + bx2 + cx + d is a polynomial on real x over real coefficients a, b, c, d wherein a ≠ 0. Which of the following statements is true?a)No choice of coefficients can make all roots identical.b)a, b, c, d can be chosen to ensure that all roots are complex.c)d can be chosen to ensure that x = 0 is a root for any given set a, b , c.d)c alone cannot ensure that all roots are real.Correct answer is option 'C'. Can you explain this answer?
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