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If a = 0.25, b = – 0.05, c = 0.5, then the value of a2 − b2 − c2 − 2bc is a2 + b2 − 2ab − c2
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7 8 -
14 17 - 1
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25 16
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Correct Option: A
| a2 + b2 − 2ab − c2 |
| = | |
| (a2 + b2 − 2ab) − c2 |
| = | |
| (a − b)2 − c2 |
| = | |
| (a − b + c)(a − b − c) |
| = | = | ||
| a − b + c | 0.25 + 0.05 + 0.5 |
| = | = | ||
| 0.8 | 8 |
