Jamb Mathematics 1987 Past Questions and Answers

Question 16:

• JAMB 1987

If a u² - 3v² and b = 2uv + v² evaluate (2a - b)(a - b²), when u = 1 and v = -1

A. 9
B. 15
C. 27
D. 33

Question 17:

• JAMB 1987

The formula Q = 1.5 + 0.5n gives the cost Q(in Naira)of feeding n people for a week. Find (in kobo) the extra cost of feeding one additional person

A. 350k
B. 200k
C. 150k
D. 50k

Question 18:

• JAMB 1987

If P varies inversely as V and V varies directly as R², find the relationship between P and R given that R = 7 when P = 2

A. P = 98R²
B. PR² = 98
C. P = \(\frac{1}{98R^{2}}\)
D. P = \(\frac{PR^{2}}{98}\)

Question 19:

• JAMB 1987

Make y the subject of the formula Z = x\(^2\) + \(\frac{1}{y^3}\)

A. Y = \(\frac{1}{(Z - x^2)^3}\)
B. Y = \(\frac{1}{(Z + x^2)^{\frac{1}{3}}}\)
C. Y = \(\frac{1}{(Z - x^2)^{\frac{1}{3}}}\)
D. Y = \(\frac{1}{\sqrt[3]{Z} - \sqrt[3]{x^2}}\)

Question 20:

• JAMB 1987

Find the values of m which make the following quadratic function a perfect square. x² + 2(m + 1)x + m + 3

A. -1, 1
B. -1, 2
C. 1, -2
D. 2, -2