Question 1092876
<pre><font size=5><b>
(2x³-5x²+6x-11)+(6x³+4x²-6x+12)-(5x³+3x²-9x+25)

Write the first two polynomials one under the other
with like terms one under the other.  Then
combine term by term:

 2x³-5x²+6x-11
 <u>6x³+4x²-6x+12</u>
 8x³-1x²+0x+ 1

and then under that bottom line:

 8x³-1x²+0x+ 1

Write the third polynomial:

  8x³-1x²+0x+ 1
<u>-(5x³+3x²-9x+25)</u>

But to subtract we must change every sign inside
the parentheses.  Then we combine them:

  8x³-1x²+0x+ 1
 <u>-5x³-3x²+9x-25</u>
  3x³-4x²+9x-24

Edwin</pre></font></b>