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Mathematics

The roots of the quadratic equation x2 - 3x - 4 = 0 are

  1. -4, 1

  2. 4, -1

  3. 4, 1

  4. -4, -1

Quadratic Equations

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Answer

Substituting 4 in x2 - 3x - 4 = 0 we get,

⇒ 42 - 3(4) - 4

⇒ 16 - 12 - 4

⇒ 16 - 16

⇒ 0.

Substituting -1 in x2 - 3x - 4 = 0 we get,

⇒ (-1)2 - 3(-1) - 4

⇒ 1 + 3 - 4

⇒ 4 - 4

⇒ 0.

Hence,Option 2 is the correct option.

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