Question
(87 x 87 + 61 x 61 - 2 x 87 x 61 = ?
Answer: Option C
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Given Exp. =` (87)^2 + (61)^2` - 2 x 87 x 61
= `(a^2 + b^2 - 2ab) ` where a = 87 and b = 61.
=` (a - b)^2 = (87 - 61)^ = (26)^2 = (20 + 6)^2`
= `(20)^2 + (6)^2` + 2 x 20 x 6 = 400 + 36 + 240)
= 676.
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