Question
The function g is the transformation of f(x) = IxI given by g(x) = -f(x + 15) – 7. Find the value of f(x) and g(x) for x = 3?
- f(3) = 3, g(3) = 27
- f(3) = 3, g(3) = -25
- f(3) = -3, g(3) = 25
- f(3) = 3, g(3) = -19
Hint:
f(x) = IxI and g(x) = -f(x + 15) – 7
substitute x=3
The correct answer is: f(3) = 3, g(3) = -25
Given that;
f(x) = IxI and g(x) = -f(x + 15) – 7
f(3) = I3I = 3
g(3) = -I3 + 15I – 7 = -18 -7 = -25
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