Need signs between terms.
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(2x + 1)(2x + 1) or (2x + 1)2 so x = -0.5
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 ?
2x(2x - 1)
-2x=-4x*24 x=12
4x - 7 = 2x + 15 4x = 2x +222x = 22x = 11