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x+3 : x^2 +6x +9 :: x + 4 : _______

a. 2x + 8 b. x + 16 c. x^2 +16 +4x d. x^2+8x+16
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x^2+8x+16

x+3, when squared, equals x^2 +6x +9 . Similarly x + 4 squared equals x^2+8x+16.
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