Polynomials - Jamb Mathematics Past Questions and Answers

Question 71:

• JAMB 1981

The positive root of t in the following equation, 4t2 + 7t - 1 = 0, correct to 4 places of decimal, is

A. 1.0622
B. 10.6225
C. 0.1328
D. 0.3218
E. 2.0132

Question 72:

• JAMB 1981

If b = a + cp and r = ab + \(\frac{1}{2}\)cp², express b² in terms of a, c, r.

A. B² = aV + 2cr
B. B² = ar + 2c²r
C. B² = a² = \(\frac{1}{2}\) cr²
D. B² = \(\frac{1}{2}\)ar² + c
E. B² = 2cr - a²

Question 73:

• JAMB 1981

Multiply x² + x + 1 by x² - x + 1

A. X⁴ - x + x²
B. X⁴ - x² + x²
C. X⁴ + x² + 1
D. X⁴ + x²

Question 74:

• JAMB 1981

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

Question 75:

• JAMB 1981

In the figure, find x in terms of a, b and c.

A. A + b + c
B. 180^o - (a + b + c)
C. A - b - c
D. A + b
E. A + c