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= 3x(9x² - 6xy + 4y²) + 2y(9x² - 6xy + 4y²)
= 27x³ - 18x²y + 12xy² + 18x²y - 12xy² + 8y³
= 27x³ + 8y³
2) (7a² + 4a)² = (7a²)² + 2(7a²)(4a) + (4a)²
= 49a⁴ + 56a³ + 16a²