book Maths Puzzle Numerical Ability

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

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book Other Question

Good Morning,

I need to Graph the equation, identifying the y-intercept and put it on
a graph. I am reading the book but still confused. can you help, thanks

y = 3 - 4x please help me simplify this:

(1 + 5i)^-1

thanks, i really appreciate your help