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  9. Q352

RRB Group D (Level-1 posts) 2022 · Question 352 of 598

If x2 + 2x + 9 = (x - 2)(x - 3), then the resultant equation is:

  1. Aa cubic equation
  2. Ba cubic polynomial
  3. Ca quadratic equation
  4. Dnot a quadratic equationCorrect

Answer: D. not a quadratic equation

Explanation

Expanding (x - 2)(x - 3) gives x² - 5x + 6. Since x² + 2x + 9 ≠ x² - 5x + 6, equating both sides does not yield a valid quadratic equation, making it “not a quadratic equation.”

Source: RRB Group D 2022 Prev. Yr. Paper (18 Aug 2022) (Shift 2) - Prepp · reliable-secondary

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