Change Of Subject Of Formula - Mathematics Jamb Past Questions and Answers

Question 31 :

• JAMB 1998

If b³ = a^-2 and c^{\(\frac{1}{3}\)} = a^{\(\frac{1}{2}\)}b, express c in terms of a

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

Question 32 :

• JAMB 1998

Make \(\frac{a}{x}\) the subject of formula \(\frac{x + 1}{x - a}\)

A. \(\frac{m - 1}{m + 1}\)
B. \(\frac{m + 1}{1 - m}\)
C. \(\frac{m - 1}{1 + m}\)
D. \(\frac{m + 1}{m - 1}\)

Question 33 :

• JAMB 2002

Make r subject of the formula given that \(\frac{x}{r+a}=\frac{a}{r}\)

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

Question 34 :

• JAMB 2002

The inverse function f(x) = 3x + 4 is

A. (x-4)/3
B. (x-5)/5
C. (x+3)/4
D. (x+4)/3

Question 35 :

• JAMB 2005

The weight W kg of a metal bar varies jointly as its length L meters and the square of its diameter d meters. If w = 140 when d = 4²/₃ and L = 54, find d in terms of W and L.

A. \(\sqrt{\frac{42W}{5L}}\)
B. \(\sqrt{\frac{6L}{42W}}\)
C. \(\frac{42W}{5L}\)
D. \(\frac{5L}{42W}\)