123 squared means the same as 123 x 123. Squaring a number is the same as multiplying the number with itself.
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X=-3
x squared -2x-3 equals 0 is the same as (x + 1)(x - 3) = 0
She isn't. 4x squared is 4 times (x squared). That is, 4 times (3 squared) = 4 times 9. If you want it to be the square of 4x (which would be the square of 4 times 3, ie, 12), you have to write it as (4x)squared.
y=4x-12-3 is the equation of a straight line. It does not have a vertex. Did you mean y=x squared - 12x - 3 ?
(x, y) = (-3, -3) or (3, 3)