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Question

If f(x)=|84x|, then

A
f(x)=84x when x2
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B
f(x)=84x when x2
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C
f(x)=4x8 when x>2
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D
f(x)=4x8 when x<2
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Solution

The correct options are
B f(x)=84x when x2
C f(x)=4x8 when x>2
f(x)={ 84x ,84x0(84x) ,84x<0
f(x)={84x ,84x4x8 ,8<4x
f(x)={84x ,x24x8 ,x>2

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