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= ( 3x + 5) x (3x+5)
= 9x² + 15x +15x + 25
= 9x² +30x +25
= (3x+5)²
= (3x+5)(3x+5)
= 3x(3x+5) + 5 (3x+5)
= 9x² + 15x + 15x + 25
= 9x² + 30x + 25