ALGEBRA - Jamb Mathematics Past Questions and Answers

Question 136:

• JAMB 1981

Find the value of x satisfying \(\frac{x}{2}\) - \(\frac{1}{3}\) < \(\frac{2x}{5}\) + \(\frac{1}{6}\)

A. X < 5
B. X < 7\(\frac{1}{2}\)
C. X > 5
D. X > 7\(\frac{1}{2}\)

Question 137:

• JAMB 1981

The positive root of t in the following equation, 4t2 + 7t - 1 = 0, correct to 4 places of decimal, is

A. 1.0622
B. 10.6225
C. 0.1328
D. 0.3218
E. 2.0132

Question 138:

• JAMB 1981

The first term of an Arithmetic progression is 3 and the fifth term is 9. Find the number of terms in the progression if the sum is 81

A. 12
B. 27
C. 9
D. 4
E. 36

Question 139:

• JAMB 1981

Simplify T = \(\frac{4R_2}{R_1^{-1} + R_2^{-1} + 4R_3^{-1}}\)

A. \(\frac{4R_1 \times R_2 R_3}{R_2R_3 + R_1R_3 + 4R_1 R_2}\)
B. \(\frac{R_1 R_2 R_3}{R_2R_3 + R_1R_2 + 4R_1 R_2}\)
C. \(\frac{16R_1 R_2 R_3}{R_2R_3 + R_1R_2 + R_1 R_2}\)
D. \(\frac{4R_1 R_2 R_3}{4R_2R_3 + R_1R_2 + 4R_1 R_2}\)

Question 140:

• JAMB 1981

If b = a + cp and r = ab + \(\frac{1}{2}\)cp², express b² in terms of a, c, r.

A. B² = aV + 2cr
B. B² = ar + 2c²r
C. B² = a² = \(\frac{1}{2}\) cr²
D. B² = \(\frac{1}{2}\)ar² + c
E. B² = 2cr - a²