(3x+2y)² + 2(3x+2y) (3x-2y) + (3x-2y)² এর সরল ফল কত?
A 36x²y²
B 9x²y²
C 36x²
D 9x²
Solution
Correct Answer: Option C
(3x + 2y)² + 2(3x + 2y) (3x - 2y) + (3x - 2y)²
= a² + 2ab + b²
[3x + 2y = a, 3x - 2y = b ধরে]
= (a + b)²
= (3x + 2y + 3x - 2y)²
= (6x)²
= 36x²