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Question 151897: factorise 20ax-15ay-4bx-3by: factorise 20ax-15ay-4bx-3by
Answer by nabla(409) About Me  (Show Source):
You can put this solution on YOUR website!
The first two terms have 5a in common. The second two have b. Make sure that I am correct in assuming you misstyped the 2nd minus sign.

20ax-15ay+4bx-3by=5a(4x-3y)+b(4x-3y)=(5a+b)(4x-3y)