Two mark exercise problems IV — task. Mathematics State Board, Class 8.

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Factorise the following expressions:

(i)

$x^2 + 14x + 49 =$

(ii)

$y^2 - 10y + 25 =$

(iii)

$3x^3 - 45x^2y + 225xy^2 - 375y^3 =$

Answer variants:

$(x + 7)^3$

$3(x + 5y)^3$

$(y + 5)^2$

$(y - 5)^2$

$(x + 7)^2$

$3(x - 5y)^3$

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