When x + y + z = 9 and xy + yz + zx = 11, then x3 - y3 - z3 - 3xyz equals
| A. | 384 |
| B. | 192 |
| C. | 432 |
| D. | 48 |
Answer : C Explanation : x3 - y3 - z3 - 3xyz = (x+y+z)(x2+y2+z2-xy-yz-zx) = 9[(x + y + z)2 - 3(xy + yz + zx)] = 9(81 - 33) = 432. |
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Option: A Explanation : Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. Explanation will come here. |
