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CBSE Class 8 Answered

4(x+y)²-28(x²-y²)+49(x-y)²
Asked by kirtiagarwal148 | 19 Feb, 2018, 11:29: AM
answered-by-expert Expert Answer
begin mathsize 16px style 4 open parentheses straight x plus straight y close parentheses squared minus 28 left parenthesis straight x squared minus straight y squared right parenthesis plus 49 left parenthesis straight x minus straight y right parenthesis squared
equals 4 open parentheses straight x plus straight y close parentheses squared minus 28 open parentheses straight x plus straight y close parentheses left parenthesis straight x minus straight y right parenthesis plus 49 left parenthesis straight x minus straight y right parenthesis squared
equals open square brackets 2 open parentheses straight x plus straight y close parentheses minus 7 left parenthesis straight x minus straight y right parenthesis close square brackets squared
equals open square brackets 2 straight x plus 2 straight y minus 7 straight x plus 7 straight y close square brackets squared
equals open parentheses 9 straight y minus 5 straight x close parentheses squared end style
Answered by Sneha shidid | 19 Feb, 2018, 12:06: PM

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