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

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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:

$(6m + 5)(6m + 5)$

$(a + 3b - c)(a + 3b - c)$

$(y - 10)(y + 10)$

$(a + 3b + c)(a + 3b - c)$

$(6m - 5)(6m + 5)$

$(y + 10)(y + 10)$

$(8x - 7y)(8x - 7y)$

$(8x + 7y)(8x - 7y)$

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