Question 41325
<pre><font color = "red"><font size = 5><b>(6a-5y)<font color = "blue">(7a+3y)</font>

<font color = "black">Distribute the red parenthetical expression 
taken as a whole, into the blue parenthetical
expression:</font>

<font color = "red">(6a-5y)</font><font color = "blue">(7a) + </font><font color = "red">(6a-5y)</font><font color = "blue">(3y)</font>

<font color = "black">Reverse the order of multiplication in each 
of the two terms:</font>

<font color = "blue">7a</font><font color = "red">(6a-5y)</font><font color = "blue"> + 3y</font><font color = "red">(6a-5y)</font>

<font color = "black">Now distribute the blue factors into the red 
parenthetical expressions, getting these purple
terms:</font>

<font color = "purple">42a²-35ay + 18ay-15y²

42a² - 35ay + 18ay - 15y²</font>

<font color = "black">Combine the middle two like terms as</font> <font color = "purple">-17ay

42a² - 17ay - 15y²</font>  

<font color = "black">Edwin</pre>