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