Jamb Mathematics Past Questions For Year 1981
Question 36
Multiply \(x^2+ x + 1\) by \(x^2\)- x + 1
- A. x\(^4\) - x + x²
- B. x\(^4\) - x² + x²
- C. x\(^4\) + x² + 1
- D. x\(^4\) + x²
Question 37
A baking recipe calls for 2.5kg of sugar and 4.5kg of flour. With this recipe some cakes were baked using 24.5kg of a mixture of sugar and flour. How much sugar was used?
- A. 12.25kg
- B. 6.75kg
- C. 8.75kg
- D. 15.75kg
- E. 8.25kg
Question 38
The difference between 4\(\frac{5}{7}\) and 2\(\frac{1}{4}\) greater by
- A. \(\frac{23}{28}\)
- B. \(\frac{24}{28}\)
- C. \(\frac{50}{56}\)
- D. \(\frac{27}{28}\)
- E. \(\frac{48}{56}\)
Question 39
What is the size of an exterior angle of a regular pentagon?
- A. 36°
- B. 60°
- C. 72°
- D. 120°
- E. 360°
Question 40
The sum of the root of a quadratic equation is \(\frac{5}{2}\) and the product of its root is 4. The quadratic equation is
- A. x + 8x² - 5 = 0
- B. 2x² - 5x + 8 = 0
- C. 2x² - 8x + 5 = 0
- D. x² + 8x - 5 = 0
