exam Maths Puzzle Numerical Ability

How do you solve y=(x-3)squared.

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exam Other Question

4 intersecting lines: S-W, T-X, U-Y, and V-Z. Centerpoint is O. Angle SOT is 5X+Y, Angle TOU=29degrees, Angle VOT = 7X+Y, Angle ZOX is 89degrees. I need to find the value of X functions
f(x)=xx+2x+3
find f(a+1)