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

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1. Factorise by using suitable identity.

$a^2 + 6ab + 9b^2 - c^2 =$

2. If

$X = a^2 - 1$ and

$Y = 1 - b^2$ , then find

$X + Y$ and factorize the same.

Answer:

Factorization of

$X + Y =$

Answer variants:

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

$(a - b)^2$

$(a + b)(a - b)$

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

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