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Difficult

Completing the Square

SATMAT-IWUV21

Which of the following is a solution to $ { x }^{ 2 }+4x+3=a $, where $ a $ is any real number?

A

$ x=-3 $

B

$ x=\sqrt { a-1 } $

C

$ x=\sqrt { a+1 } $

D

$ x=\sqrt { a+1 } -2 $