What is the square root of the following?
(x² –14x+49) (x² + 6x + 9)
(x² –14x+49) = (x² –7x-7x+49) =x(x-7)-7(x-7) =(x-7) (x-7) (x² + 6x + 9) (x² + 3x+3x+9 =x(x+3) +3(x+3) =(x+3) (x+3) 
=(x-7) (x+3)
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