Waec Mathematics 1992 Past Questions and Answers

Question 11:

• WAEC 1992

Construct a quadratic equation whose roots are \(-\frac{1}{2}\) and 2.

A. 3x²-3x+2=0
B. 3x²+3x-2=0
C. 2x²+3x-2=0
D. 2x²-3x+2=0
E. 2x²-3x-2=0

Question 12:

• WAEC 1992

Write as a single fraction \(\frac{1}{1 - x} + \frac{2}{1 + x}\)

A. \(\frac{x + 3}{1 - x^2}\)
B. \(\frac{3 - x}{(1 - x)^2}\)
C. \(\frac{3 - x}{1 + x^2}\)
D. \(\frac{3 - x}{(1 + x)^2}\)
E. \(\frac{3 - x}{1 - x^2}\)

Question 13:

• WAEC 1992

What must be added to the expression x\(^2\) - 18x to make it a perfect square?

A. 3
B. 9
C. 36
D. 72
E. 81

Question 14:

• WAEC 1992

Solve the equation \(\frac{m}{3} + \frac{1}{2} = \frac{3}{4} + \frac{m}{4}\)

A. -3
B. -2
C. 2
D. 3
E. 4

Question 15:

• WAEC 1992

The angle of a sector of a circle of radius 8cm is 240°. This sector is bent to form a cone. Find the radius of the base of the cone.

A. 16/3cm
B. 15/3cm
C. 16/5cm
D. 8/3cm
E. 16/10cm