x - 2y = 3 হলে x3 - 8y3 - 18xy এর মান কোনটি?
Solution
Correct Answer: Option A
দেওয়া আছে, x - 2y = 3
∴প্রদত্ত রাশি = x3 - 8y3 - 18xy
= (x)³ - (2y)³-3.x. 2y.3
= (x)³ - (2y)³-3.x.2y(x - 2y)
= (x - 2y)³
= (3)³ = 27
∴প্রদত্ত রাশি = x3 - 8y3 - 18xy
= (x)³ - (2y)³-3.x. 2y.3
= (x)³ - (2y)³-3.x.2y(x - 2y)
= (x - 2y)³
= (3)³ = 27
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