Question

3x²+x(x+2)-3x(2x+1)
$3x²+x(x+2)-3x(2x+1)\ \textless \ br /\ \textgreater \ \ \textless \ br /\ \textgreater \ \ \textless \ br /\ \textgreater$
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Answer 1

solution=>

=3x²+x(x+2)-3x(2x+1)

$= 3x {}^{2} + x {}^{2} + 2x - 6x {}^{2} - 3x \\ \\ = - 2x {}^{2} - x \\ \\ = - x(2x + x) \\ \\ = > x = - 2x {}^{2}$

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I hope it helps you