For how many quadratic equations, the sum of roots is equal to the product of roots?

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NDA 02/2022 Mathematics Official Paper (Held On 04 Sep 2022)
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  1. 0
  2. 1
  3. 2
  4. Infinitely many

Answer (Detailed Solution Below)

Option 4 : Infinitely many
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Detailed Solution

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Concept:

For a quadratic equation ax2 + bx + c = 0

Sum of roots = -b/a

and the product of roots = c/a

Calculation:

If the sum of roots = product of roots

\(\frac{-b}{a}=\frac ca\)

⇒ -b = c

So, there can be infinitely many quadratic equations with -b = c and a ≠ 0

∴ The correct option is (4).

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