Jamb Mathematics 1991 Past Questions and Answers

Question 26:

• JAMB 1991

Simplify \(\frac{\sqrt{1 + x} + \sqrt{x}}{\sqrt{1 + x} - \sqrt{x}}\)

A. -2x - 2\(\sqrt{x (1 + x)}\)
B. 1 + 2x + 2\(\sqrt{x (1 + x)}\)
C. \(\sqrt{x (1 + x)}\)
D. 1 + 2x - 2\(\sqrt{x (1 + x)}\)

Question 27:

• JAMB 1991

Evaluate x²(x² - 1)^{-\(\frac{1}{2}\)} - (x² - 1)^{\(\frac{1}{2}\)}

A. (x² - 1)^{-\(\frac{1}{2}\)}
B. (x² - 1)¹
C. (x² - 1)
D. (x² - 1)^-1

Question 28:

• JAMB 1991

Find the gradient of the line passing through the points (-2, 0) and (0, -4)

A. 2
B. -4
C. -2
D. 4

Question 29:

• JAMB 1991

At what value of x is the function y = x² - 2x - 3 minimum?

A. 1
B. -1
C. -4
D. 4

Question 30:

• JAMB 1991

Find the sum of the first 20 terms in an arithmetic progression whose first term is 7 and last term is 117.

A. 2480
B. 1240
C. 620
D. 124