Two functions f and g are defined by \(f : x \to 3x - 1\)
FURTHER MATHEMATICS
WAEC 2006
Two functions f and g are defined by \(f : x \to 3x - 1\) and \(g : x \to 2x^{3}\), evaluate \(fg(-2)\).
- A. -49
- B. -47
- C. -10
- D. -9
Correct Answer: A. -49
Explanation
\(g : x \to 2x^{3}\)
\(g(-2) = 2(-2^{3}) = 2(-8) = -16\)
\(f : x \to 3x - 1\)
\(f(-16) = 3(-16) -1 = -48 - 1 = - 49\)
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