exam Maths Puzzle Numerical Ability

Please explain this problem, Thanks!

X^2 + 125 =

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exam Other Question

The process of writing a quadratic equasion in the form (x + a)^2 = b is known as?__________________________
(PS: Please show how you worked it out. I have been having mojor problems with these kinds of questions. Thanks.) Im not sure if this is what i need but i would like to know how do i do this problem? I relly need help.