9x square + 4ysquare =97 or xy = 6 find 27 x cube + 8 y cube
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You'll find the answer if you go with the right process.
Step-by-step explanation:
9x²+4y²=97, xy=6
(3x+2y)²=97
(3x+2y)²+12xy=97
(3x+2y)²+12(6)=97
(3x+2y)²+72=97
(3x+2y)²=97-72
=>(3x+2y)²=25 So, (3x+2y)=5
27x³+8y³
(3x+2y)³
(3x+2y)³+18xy(3x+2y)
(5)³+18(6)(5)
125+108(5)
125+540
=665
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