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Solve x2 − 2x − 3 = 0

Mathematics
JAMB 2015

Solve x2 − 2x − 3 = 0
  • A. x = 2 or 1
  • B. x = 3 or -1
  • C. x = 1 or 0
  • D. x = 1 or 2
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Correct Answer: Option B
Explanation
x2 − 2x − 3 = 0

−3x + x = − 2x

− 3x × x = − 3x2

(x2 − 3x)(x − 3) = 0

(x − 3)(x + 1) = 0

Either (x − 3) = 0 or (x + 1) = 0

x = 3 or − 1

There is an explanation video available below.


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Explanation Video

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