What is f(20)+f(-20) equal to?
Consider the following for the two (02) items that follow : A function f is such that f(xy)=f(x+y) for all real values of x and y, and f(5)=10.
- A. 0
- B. 10
- C. 20 ✓
- D. 40
Correct Answer: C. 20
Explanation
From the previous reasoning, f(x) = 10 for all real x. Therefore, f(20) = 10 and f(-20) = 10. The sum is 10 + 10 = 20.
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