Three mark example problems I — task. Mathematics State Board, Class 7.

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Factorise:

1.

$9x^2 + 30xy + 25y^2 =$

2.

$4x^2 - 4xy + y^2 =$

Answer variants:

$(3x + 5y)$ and

$(3x + 5y)$

$(2x - y)$ and

$(2x - y)$

$(3x + 5y)$ and

$(3x - 5y)$

$(2x + y)$ and

$(2x - y)$

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