InterviewSolution
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InterviewSolution
| 1. |
a2 – b2 – c2 + 2bc + a + b – c when factorised equals(a) (a – b – c) (a – b + c + 1) (b) (a + b – c) (a – b + c + 1) (c) (a – b + c) (a – b + c + 1) (d) (a + b + c) (a – b + c + 1) |
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Answer» (b) (a + b - c) (a - b + c + 1) a2 - b2 - c2 + 2bc + a + b - c = [a2 - (b2 + c2 - 2bc)] + (a + b - c) = [a2 - (b - c)2] + (a + b + c) = [(a + b - c)(a - b + c) + (a + b - c)] = (a + b - c) (a - b + c + 1) |
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