Factorise of 9y² + 36 yz + 36z²
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Identity – (a+b)² = a²+2ab+b²
9y² + 36yz + 36z²
= (3y)² + 2(3y)(6z) + (6z)²
= (3y+6z)²
= (3y+6z)(3y+6z)
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