Roots of a polynomials - Jamb Mathematics Past Questions and Answers

Question 1:

• JAMB 1979

The mean of the numbers 1.2, 1.0, 0.9, 1.4, 0.8, 0.8, 1.2 and 1.1 is

A. 1.5
B. 0.8
C. 1.0
D. 1.02
E. 1.05

Question 2:

• JAMB 2017

If and are the roots of the equation 3x² + bx 2 = 0. Find the value of \(\frac{1}{\alpha}\) + \(\frac{1}{\beta}\)

A. \(\frac{-5}{3}\)
B. \(\frac{-2}{3}\)
C. \(\frac{1}{2}\)
D. \(\frac{5}{2}\)

Question 3:

• JAMB 2017

If α and β are the roots of the equation 3x² + bx − 2 = 0. Find the value of \(\frac{1}{\alpha}\) + \(\frac{1}{\beta}\)

A. \(\frac{-5}{3}\)
B. \(\frac{-2}{3}\)
C. \(\frac{1}{2}\)
D. \(\frac{5}{2}\)

Question 4:

• JAMB 1979

If x³ - 12x - 16 = 0 has x = -2 as a solution then the equaion has

A. X = -4 as a solution also
B. 3 roots all different
C. 3 roots with two equal and the third different
D. 3 roots all equal
E. Only one root

Question 5:

• JAMB 1980

Find the roots of the equation 10x² - 13x - 3 = 0

A. X = \(\frac{3}{5}\) or -\(\frac{1}{2}\)
B. X = \(\frac{3}{10}\) or -1
C. X = \(\frac{3}{10}\) or 1
D. X = \(\frac{1}{5}\) or \(\frac{-3}{2}\)
E. X = -\(\frac{1}{5}\) or \(\frac{3}{2}\)