Question 74194
<pre>
factor by grouping

10x^2- 12xy + 35xy- 42 y^2


   (10x^2 + 35xy) + (-12xy - 42y^2)
Factor 
   5x(2x + 7y) + (-6y)(2x + 7y)
 
   5x(2x + 7y) - 6y(2x + 7y)

    (2x + 7y)(5x - 6y)