Question 1119016
<pre>

You must simplify the expression before trying
to answer the questions.  Here's what you must 
do first:

{{{matrix(3,3,
y, ""="", (x-5)(5x+4)-5x^2,
y, ""="", 5x^2+4x-25x-20-5x^2,
y, ""="", -21x-20



)}}}

So you see, since the x² term cancels out, it is
not a quadratic function, but a linear function.

Edwin</pre>