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Solve the inequality x - 1 > 4(x + 2)

Mathematics
JAMB 1987
Solve the inequality x - 1 > 4(x + 2)
  • A. x > -3
  • B. x < -3
  • C. 2 < x < 3
  • D. -3 < x < -2
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Correct Answer: Option B
Explanation
x - 1 > 4(x + 2) = x - 1 > 4x + 8

4x + 8 < x - 1 = 4x - x < -1 -8

= 3x < -9

∴ x < -3
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