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Solve with the formula, then check by putting each root back into the equation. The roots are:

Class 10The Quadratic FormulaQuadratic Equations
  • A−3 and
  • B3 and
  • C3 and
  • D and −3

Step-by-Step Solution

or . Substituting back: , and . Substituting is what catches a swap such as 3 and , since 27 + 24 − 3 is nowhere near 0.
Answer: D) and −3

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