SOLUTION: I need help with factor by grouping: 15*x^3-40*x^2+21*x-56=

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: I need help with factor by grouping: 15*x^3-40*x^2+21*x-56=      Log On


   

Question 462667: I need help with factor by grouping:
15*x^3-40*x^2+21*x-56=
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
factor by grouping:
15*x^3-40*x^2+21*x-56
-----------------
= 5x^2(3x-8) + 7(3x-8)
------
= (3x-8)(5x^2+7)
===================
Cheers,
Stan H.
==============