exam Maths Puzzle Numerical Ability

Do exponential functions only model phenomena that grow, or can they also model phenomena that decay? Explain what is different in the form of the function in each case.

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I am having some awful troubles trying to figure out a few problems...
Solve:
(x+5)^2 = 3

Can anyone help me grasp this please? Thank you so much!
Please help! I can't solve this problem. x^4-4x^2+1/x-4
The instructions are to use synthetic division to devide. I know the answer should be x^3+4x^2+12x+48+193/x-4
I tried se