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| 1. |
X+y=12 and xy= 27 then x3 + y3 is |
| Answer» x³ + y³=(x + y)(x² + y² - xy)=12(x² + y² + 2xy - 2xy - xy)=12{(x + y)² - 3xy}=12{(12)² - 3 × 27}=12{144 - 81}=12 × 63=756 (Ans.) | |