Verified Solution Mathematics Polynomials

If (x-1) and (x+1) are factors of P(x) = ax³ + bx² + cx + d, then which of the following statements must be true?

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Solution ✔ Verified
  • Aa + c = 0 and b + d = 0
  • Ba + b = 0 and c + d = 0
  • Ca - c = 0 and b - d = 0
  • Da + d = 0 and b + c = 0
Explanation

If (x-1) is a factor, P(1) = a+b+c+d = 0. If (x+1) is a factor, P(-1) = -a+b-c+d = 0. Adding these two equations gives 2b + 2d = 0, so b+d = 0. Subtracting the second from the first gives 2a + 2c = 0, so a+c = 0.

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