Jamb Mathematics 1987 Past Questions and Answers

Question 21:

• JAMB 1987

Factorize 6^{2x + 1} + 7(6^x) - 5

A. [3(6^x) - 5][2(6^x)m + 1]
B. [3(6^x) + 5][2(6^x) - 1]
C. [(6^x) - 5][3(6^x) + 1]
D. [2(6^x) + 5][3(6^x) - 1]

Question 22:

• JAMB 1987

Find the values of y which satisfy the simultaneous equations x + y = 5, x² - 2y² = 1

A. -12, -2
B. -12, 12
C. 12, -2
D. 2, -2

Question 23:

• JAMB 1987

An (n - 2)² sided figure has n diagonals. Find the number n diagonals for 25-sided figure

A. 7
B. 8
C. 9
D. 10

Question 24:

• JAMB 1987

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

A. X > -3
B. X < -3
C. 2 < x < 3
D. -3 < x < -2

Question 25:

• JAMB 1987

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

A. \(\frac{x + y}{2x + y}\)
B. \(\frac{x + y}{2x - y}\)
C. \(\frac{x - y}{2x - y}\)
D. \(\frac{x - y}{2x + y}\)