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For which of these equations is the quadratic formula genuinely needed,
because the roots are irrational and cannot be factorised over integers?

Class 10The Quadratic FormulaAlgebra — Quadratics
  • A
  • B
  • C
  • D

Step-by-Step Solution

Discriminants: 1, 9, 29 and 1. Only 29 is not a perfect square, so only has irrational roots, . The other three factorise neatly.
Answer: C)

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