book Maths Puzzle Numerical Ability

please help me simplify this:

(1 + 5i)^-1

thanks, i really appreciate your help

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book Other Question

Do not understand how to work the following problem; please help

If G(x) = 2-x to the second power find

G(3+H) - G (3)
______________
H

Your help is greatly apprec 3x+5y=0
2x-5y=-25