June 2017 Paper 2 Q16

(a) \(a = 3^{2b}\)

Circle the correct expression for \(\dfrac{1}{a}\) [1 mark]

• \(3^{2b - 1}\)
• \(3^{-2b}\)
• \(-3^{2b}\)
• \(\left(\dfrac{1}{3}\right)^{-2b}\)

(b) \(y = 5^x\)

Circle the correct expression for \(25y\) [1 mark]

• \(5^{x+2}\)
• \(25^x\)
• \(5^{2x}\)
• \(125^x\)

(c) \(w = 2^m\)

Circle the correct expression for \(w^3\) [1 mark]

• \(8^{3m}\)
• \(6^m\)
• \(2^{m+3}\)
• \(2^{3m}\)