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Mathematics 1989 JAMB Past Questions

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21

Solve the pair of equation for x and y respectively \(2x^{-1} - 3y^{-1} = 4; 4x^{-1} + y^{-1} = 1\)

  • A. -1, 2
  • B. 1, 2
  • C. 2, 1
  • D. 2, -1
View Answer & Discuss (2) JAMB 1989
22
What value of Q will make the expression 4x2 + 5x + Q a complete square?
  • A. \(\frac{25}{16}\)
  • B. \(\frac{25}{64}\)
  • C. \(\frac{5}{8}\)
  • D. \(\frac{5}{4}\)
View Answer & Discuss JAMB 1989
23
find the range of values of values of r which satisfies the following inequality, where a, b and c are positive \(\frac{r}{a}\) + \(\frac{r}{b}\) + \(\frac{r}{c}\) > 1
  • A. r > \(\frac{abc}{bc + ac + ab}\)
  • B. r < abc
  • C. r > \(\frac{1}{a}\) + \(\frac{1}{b}\) + \(\frac{1}{c}\)
  • D. . \(\frac{1}{abc}\)
View Answer & Discuss JAMB 1989
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24

Express \(\frac{1}{x + 1}\) - \(\frac{1}{x - 2}\) as a single algebraic fraction

  • A. \(\frac{-3}{(x + 1)(2 - x)}\)
  • B. \(\frac{3}{(x + 1)(2 - x)}\)
  • C. \(\frac{-1}{(x + 1)}\)
  • D. \(\frac{1}{(x + 1)(x - 2)}\)
View Answer & Discuss (8) JAMB 1989
25

Simplify \(\frac{x(x + 1)^{-\frac{1}{2}} - (x + 1)^{\frac{1}{2}}}{(x + 1)^{\frac{1}{2}}}\)

  • A. \(\frac{-1}{x + 1}\)
  • B. \(\frac{1}{x + 1}\)
  • C. \(\frac{1}{x}\)
  • D. \(\frac{1}{x - 1}\)
View Answer & Discuss (6) JAMB 1989
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