Q.10 (2x+5y) = 12 and xy = 6, find the value of 8x3+125y
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Answer:
Step-by-step explanation:
1152 is the answer :D
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Answer:
8x³+125y³=(-432)
Step-by-step explanation:
2x+5y=12
Cubing on both the sides
(2x+5y)³=(12)³
(2x)³+(5y)³+3(2x)(5y)(2x+5y)=1728
8x³+125y³+30xy(2x+5y)=1728
8x³+125y³+30(6)(12)=1728. (xy=6, 2x+5y=12)
8x³+125y³+2160=1728
8x³+125y³=1728-2160
8x³+125y³=(-432)
Therefore, the value of 8x³+125y³ is (-432).
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