Question

factorise x²+6x+9-4y² ​

Answer 1

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x²+6x+9-4y²

= [x²+6x+9] - [4y²]

= [(x)² + 2(x)(3) + (3)²] - [2y]²

= (x+3)² - (2y)²

= (x+3+2y)(x+3-2y)