Question 173657
<pre><font size = 4 color = "indigo"><b>
{{{15 + 3y - 5x^2 - x^2y}}}

Factor {{{3}}} out of the first two terms
only:

{{{3(5 + y) - 5x^2 - x^2y}}}
 
Factor {{{-x^2}}} out of the last two terms
(Don't forget that when you factor out a
negative, you change the signs of everything
that goes in the parentheses:

{{{3(5 + y) - x^2(5 + y)}}}

Then factor out {{{(5+y)}}}

{{{(5+y)(3-x^2)}}}

That's a much as it will factor.

Edwin</pre>