ALGEBRA - Jamb Mathematics Past Questions and Answers

Question 96:

• JAMB 1978

If x2 + 4 = 0, then x ?

A. 4
B. -4
C. 2
D. -2
E. None of the above

Question 97:

• JAMB 1978

Five years ago, a father was 3 times as old as his son, now their combined ages amount to 110years. thus, the present age of the father is

A. 75 years
B. 60 years
C. 98 years
D. 80 years
E. 105 years

Question 98:

• JAMB 1978

Father reduced the quantity of food bought for the family by 10% when he found that the cost of living had increased 15%. Thus the fractional increase in the family food bill is now

A. \(\frac{1}{12}\)
B. \(\frac{6}{35}\)
C. \(\frac{19}{300}\)
D. \(\frac{7}{200}\)
E. \(\frac{5}{100}\)

Question 99:

• JAMB 1978

Given that \(a*b = ab + a + b\) and that \(a ♦ b = a + b = 1\). Find an expression (not involving * or ♦) for (a*b) ♦ (a*c) if a, b, c, are real numbers and the operations on the right are ordinary addition and multiplication of numbers

A. Ac + ab + bc + b + c + 1
B. Ac + ab + a + c + 2
C. Ab + ac + a + b + 1
D. Ac + bc + ab + b + c + 2
E. Ab + ac + 2a + b + c + 1

Question 100:

• JAMB 1978

Simplify \(\frac{a - b}{a + b}\) - \(\frac{a + b}{a - b}\)

A. \(\frac{4ab}{a - b}\)
B. \(\frac{-4ab}{a^2 - b^2}\)
C. \(\frac{-4ab}{a^{-2} - b}\)
D. \(\frac{4ab}{a^{-2} - b^{-2}}\)