Question 1047011
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<font color="red"><b>x</font></b><font color="blue"><b> + x<sup>2</sup> + 2x<sup>2</sup></font></b> <font color="red"><b>- 3x</font></b>

Put a 1 before each of the first two terms to show their understood
coefficient:

<font color="red"><b>1x</font></b><font color="blue"><b> + 1x<sup>2</sup> + 2x<sup>2</sup></font></b> <font color="red"><b>- 3x</font></b>

The two red terms are like terms.
The two blue terms are like terms.

Combine the two red terms <font color="red"><b>1x - 3x = -2x</font></b>

Combine the two blue terms <font color="blue"><b>+ 1x<sup>2</sup> + 2x<sup>2</sup> = 3x<sup>2</sup></font></b>

Answer:  <font color="red"><b>-2x</font></b> <font color="blue"><b>+ 3x<sup>2</sup></font></b>

If you want it in descending order, then reverse the terms:

<font color="blue"><b>+ 3x<sup>2</sup></font></b><font color="red"><b> - 2x</font></b>

Now you can eliminate the + in front:

<font color="blue"><b>3x<sup>2</sup></font></b><font color="red"><b> - 2x</font></b>

Edwin</pre></b>