UPSKILL MATH PLUS

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Factorise the following using suitable identity.
 
(i) \(y^2 + 20y + 100 =\)
 
(ii) \(36m^2 + 60m + 25 =\)
 
(iii) \(64x^2 - 112xy + 49y^2 =\)
Answer variants:
\((6m + 5)(6m + 5)\)
\((a + 3b - c)(a + 3b - c)\)
\((y - 10)(y + 10)\)
\((a + 3b + c)(a + 3b - c)\)
\((6m - 5)(6m + 5)\)
\((y + 10)(y + 10)\)
\((8x - 7y)(8x - 7y)\)
\((8x + 7y)(8x - 7y)\)