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# Solving with a Mystery Number

SATMAT-IVGK4K

Which of the following are all the solutions to the equation ${ x }^{ 2 }+2x\left( a+1 \right) +4a=0$?

A

$x=2, x=2a$

B

$x=-2, x=-2a$

C

$x=2, x=-a$

D

$x=-2, x=a$