Question 1061310
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The head of a circular drum has an area of 9x^2pi +12xpi+4pi. 

a) What is the radius of the drum in terms of x?


b) If x=9, what is the radius length?
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The radius is {{{sqrt(9x^2+12x +4)}}} = {{{sqrt((3x+2)^2)}}} = |3x+2|.


If x= 9, then the radius is 3*9+2 = 27+2 = 29 units.
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