UPSKILL MATH PLUS

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Find the value of
 
1. \(x^3 + y^3 – 12xy + 64\), when \(x + y = – 4\)
 
Ans:
 
2. \(x^3 – 8y^3 – 36xy – 216\), when \(x = 2y + 6\)
 
Ans: