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Find the values of p for which the equation x2 - (p - 2)x + 2p + 1 = 0

Find the values of p for which the equation x2 - (p - 2)x + 2p + 1 = 0
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  • A (21, 0)
  • B (0, 12)
  • C (1, 2)
  • D (3, 4)
  • E (4, 5)
Correct Answer: Option B
Explanation:
Equal roots implies b2 - 4ac = 0
a = 1b = - (p - 2), c = 2p + 1
[-(p - 2)]2 - 4 x 1 x (2p + 1) = 0
p2 - 4p + 4 - 4(2p + 1) = 0
p2 - 4p = 4 - 8p - 4 = 0
p2 - 12p = 0
p(p - 12) = 0
p = 0 or 12

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