The function \(f : F \to R\) = \(f(x) = \begin{cases} 3x + 2 :
FURTHER MATHEMATICS
WAEC 2013
The function \(f : F \to R\)
= \(f(x) = \begin{cases} 3x + 2 : x > 4 \\ 3x - 2 : x = 4 \\ 5x - 3 : x < 4 \end{cases}\). Find f(4) - f(-3).
- A. 28
- B. 26
- C. -26
- D. -28
Correct Answer: A. 28
Explanation
\(f(4) = 3(4) - 2 = 12 - 2 = 10\)
\(f(-3) = 5(-3) - 3 = -15 - 3 = -18\)
\(f(4) - f(-3) = 10 - (-18) = 28\)
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