For f(x)= x ^3 - x ^2 , which gives an output of 48?
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replace values directly in the expression 
x ^3 - x ^2
f(2)= 2 ^3 - 2 ^2
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 f(-8) = -572 
 f(-4) = -80
 f(4) = 48
 f(8) = 448
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Answer f(4) = 48