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CBSE Class 8 Answered

Factorise
(4x-5y)²-16z²
Asked by Shawn | 23 Jan, 2016, 01:52: PM
answered-by-expert Expert Answer
begin mathsize 11px style open parentheses 4 straight x minus 5 straight y close parentheses squared minus 16 straight z squared equals open parentheses 4 straight x minus 5 straight y close parentheses squared minus open parentheses 4 straight z close parentheses squared Let space 4 straight x minus 5 straight y equals straight A space and space 4 straight z equals straight B So space the space expression space becomes straight A squared minus straight B squared equals open parentheses straight A plus straight B close parentheses open parentheses straight A minus straight B close parentheses Substituting space back space the space values space of space straight A space and space straight B comma space we space get open parentheses 4 straight x minus 5 straight y plus 4 straight z close parentheses open parentheses 4 straight x minus 5 straight y minus 4 straight z close parentheses end style
Answered by satyajit samal | 24 Jan, 2016, 11:36: AM

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