x + y = 3, x - y = 1 হলে, 4xy এর মান –
Solution
Correct Answer: Option D
দেওয়া আছে
x + y = 3
x - y = 1
আমরা জানি,
4xy = (x + y)2 - (x + y)2
= 32 - 12
= 9 - 1
= 8
x + y = 3
x - y = 1
আমরা জানি,
4xy = (x + y)2 - (x + y)2
= 32 - 12
= 9 - 1
= 8
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