exam Maths Puzzle Numerical Ability

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!

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exam Other Question

Factor:

4w^2-22w+10
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.