Mathematics 1989 Jamb Past Questions and Answers

Question 21 :

• JAMB 1989

What are K and L respectively if \(\frac{1}{2}\)(3y - 4x)² = (8x² + kxy + Ly²)

A. -12, \(\frac{9}{2}\)
B. -6, 9
C. 6, 9
D. 12, \(\frac{9}{2}\)

Question 22 :

• JAMB 1989

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

Question 23 :

• JAMB 1989

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. \(\frac{5}{4}\)

Question 24 :

• JAMB 1989

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. . \(\frac{1}{abc}\)

Question 25 :

• JAMB 1989

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. \(\frac{1}{(x + 1)(x - 2)}\)