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

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Factorise the following algebraic expressions by using the identity

$a^2 - b^2 = (a + b)(a - b)$ .

(i)

$z^2 - 16 =$

(ii)

$9 - 4y^2 =$

(iii)

$25a^2 - 49b^2 =$

Answer variants:

$(5a + 7b)(5a - 7b)$

$(z - 4)(z - 4)$

$(z + 4)(z - 4)$

$(5a - 7b)(5a - 7b)$

$(2y + 3)(2y - 3)$

$(3 + 2y)(3 - 2y)$

Did you find an error?

6. Two mark exercise problems II