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Question

If f : R R is a function defined by

f(x)={2x if x03x if x<0

Find the value of f(-10).f(2) + f(-1) – f(3).

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Solution

f(x)={2x if x03x if x<0

(f(-10) = -3(-10) = 30

f(2) = 2(2) = 4

f(-1) = -3(-1) = 3

f(3) = 2(3) = 6

f (-10).f(2) + f(-1) – f(3) = (30)(4) + 3 – 6

= 120 – 3 = 117


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