PDF chapter test TRY NOW

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