exam Maths Puzzle Numerical Ability

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

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exam Other Question

Please help me. I can not figure this one out.

Solve each of the following systems of linear inequalities graphically.

3x-y �is less than or equal to sign�
x � is great 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