(a + b + c - d)2 - (a - b - c + d)2 = ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e 4a(b + c - d).
| Understanding/Application |
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(a + b + c - d)2 - (a - b - c + d)2 = [(a + b + c - d) - (a - b - c + d)] [(a + b + c - d) + (a - b - c + d)] |
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= 2a(2b + 2c - 2d) = 4a(b + c - d) |