Question 924105
Hi
<font size=3 color="red">F</font>	First terms  20
<font size=3 color="red">O</font>	Outside terms -15x
<font size=3 color="red">I</font>	Inside terms  - 4x
<font size=3 color="red">L</font>	Last terms  3x^2
......
(5-x)(4-3x) = 20 - 19x + 3x^2