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a2 + b2 is equal to
- a)(a + b )2 – 2ab
- b)(a – b)2 – 2xy
- c)(a + b)2 – 2xy
- d)(a – b)2 + 4 ab
Correct answer is option 'A'. Can you explain this answer?
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a2+ b2is equal toa)(a + b )2– 2abb)(a – b)2– ...
As (a+b)^2-2ab=a^2+b^2+2ab-2ab=a^2+b^2 like this similarly, a^2+b^2=(a+b)^2-2ab
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a2+ b2is equal toa)(a + b )2– 2abb)(a – b)2– 2xyc)(a + b)2– 2xyd)(a – b)2+ 4 abCorrect answer is option 'A'. Can you explain this answer?
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