(3x – 5y)² = (3x)² – 2·3x·5y + (5y)² = 9x² – 30xy + 25y²
(7a + 6b)² = (7a)² + 2·7a·6b + (6b)² = 49a² + 84ab + 36b²
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(3x – 5y)² = (3x)² – 2·3x·5y + (5y)² = 9x² – 30xy + 25y²
(7a + 6b)² = (7a)² + 2·7a·6b + (6b)² = 49a² + 84ab + 36b²