InterviewSolution
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InterviewSolution
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The factors of a2 - b2 - 4c2 + 4d2 - 4(ad - bc) are :(a) (a + 2d + b + 2c)(a - 2d - b + 2c) (b) (a - 2d + b - 2c)(a + 2d - b + 2c) (c) (a - 2d + b - 2c)(a - 2d - b + 2c) (d) (a - 2d - b - 2c)(a + 2d - b + 2c) |
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Answer» (c) (a - 2d + b - 2c)(a - 2d - b + 2c) a2 - b2 - 4c2 + 4d2 - 4(ad - bc) = a2 - b2 - 4c2 + 4d2 - 4ad + 4bc = (a2 - 4ad + 4d2) - (b2 - 4bc + 4c2) = (a - 2d)2 - (b - 2c)2 = (a - 2d + b - 2c)(a - 2d - b + 2c) |
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