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evaluate f(4) when f(x)= 4x[sqr(3-x)]

evaluate f(4) when f(x)= 4x[sqr(3-x)]. 
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1 Answer

Substitute the 4 into the equation
f(4)=4(4)(√3-4)
f(4)=16(√-1)
ANSWER:
f(4)=16i
 
i is the square root of (-1).