If you want to simplify this, you can add the coefficients of like terms.
... = x²(2+2) +x(4+4) +(-3-3)
... = 4x² +8x -6
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Since both of the parts of the sum are the same, this expression can be rewritten using the distributive property:
... = 2(2x² +4x =3)
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The sum can also be rewritten to vertex form.
... = 4(x² +2x) -6
... = 4(x² +2x +1) -6 -4(1)
... = 4(x +1)² -10
This is an expression describing a parabola with vertex (-1, -10) and a vertical scale factor of 4. It has roots (x-intercepts) at -1±√2.5.