exam Maths Puzzle Numerical Ability

The question is; perform the indicated operations and write the result in standard form (a+bi)
#42)
the square root of -12 multiplied by(the square root of -4 minus square ro

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I am having some problems with theses problems

Solve: X^2+5=21

and also solve (x-4)^2=3

and 5(x-2)^2=3

Thanks a million x+5y=10
-2x-10y=-20

2x+10y=20
-2x-10y=-20
0 = 0

Just double check to make sure this is right?