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If f(x) = 4^x then f(x-1)-f(x) equals(a) 4(b) f(x)(c) 2f(x)(d) 3f(x)
f(x-1)-f(x)=4^(x-1)-4^x
=(4^x)(4^-1)-(4^x)
=4^x((1/4)-1)
=(-3/4)f(x)
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