Factoring by grouping, I am just not grasping it. For example: rs+4s(square) -r-4s

Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter5: Factoring Polynomials
Section5.11: Using Several Methods Of Factoring
Problem 43WE
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Factoring by grouping, I am just not grasping it. For example:

rs+4s(square) -r-4s

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