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Question
If f(x) = 2|x| + 3x, then find f(– 5)
Solution
f(x) = 2|x| + 3x
f(– 5) = 2|– 5| + 3(– 5)
= 2(5) – 15 ........[|x| = – x, x < 0]
= 10 – 15
= – 5
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