x + y = 4 এবং x − y = 3 হলে, 8xy এর মান কত ?
Solution
Correct Answer: Option C
দেয়া আছে, x + y = 4
x − y = 3
___________________
(+) করে 2x = 7
∴ x = 7/2
আবার, x + y = 4
x − y = 3
___________________
(−)করে 2y = 3
∴ y = 1/2
অতএব, 8xy = 8×7/2×1/2= 14
x − y = 3
___________________
(+) করে 2x = 7
∴ x = 7/2
আবার, x + y = 4
x − y = 3
___________________
(−)করে 2y = 3
∴ y = 1/2
অতএব, 8xy = 8×7/2×1/2= 14
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