Question 631292
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Error 1:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ -3\ \times\ 3x^2\ =\ -9x^2\ \neq\ 9x^2]


Error 2:


You don't change the signs and subtract, you subtract, which means you change the sign and add.  Although you did end up with *[tex \LARGE 4x^2], clearly by fortuitous accident.


Error 3:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 2x\ \times\ 2x\ -\ 3\ =\ 4x^2\ -\ 6x\ \neq\ 4x^2\ +\ 6x]


Then


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 4x^2\ +\ 2x\ -\ (4x^2\ -\ 6x)\ =\ 8x]


You finish.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
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