Use synthetic division to decide whether the given number k is a zero of the polynomial function 3+3i; f(x) = x^2 +6 + 18

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answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.  

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