please solve in correct way
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(a+b) ² = a²+b²+2ab
(3/4 a+2/9 b) ²
=(3/4 a)²+(2/9 b)² +2×3/4 a × 2/9 b
=9/16 a² + 4/81 b² + 2×3×2ab/4×9
=9/16 a² + 4/81 b² + 12ab/36
=9/16 a² + 4/81 b² + 1ab/3
=9/16 a² + 4/81 b² + 1ab/3 ➡️ answer.
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