(3x+y)² = (3x)² + 2 · 3x · y + y² =
(3x+y)² = (3x)² + 2 · 3x · y + y² = 9x²+6xy+y²
(3x+y)²=9x2 + 6xy + y2
(3x)² + 2 · 3x · y + y² = 9x2+6xy+y2
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(3x+y)² = (3x)² + 2 · 3x · y + y² = 9x²+6xy+y²
(3x+y)²=9x2 + 6xy + y2
(3x)² + 2 · 3x · y + y² = 9x2+6xy+y2