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

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1. Find the value of

$(x - y)(x + y)(x^2 + y^2)$ .

Answer:

Value

$=$

2. Simplify:

(i)

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

(ii)

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

Answer variants:

$x^4 - y^4$

$2(a^2 + b^2)$

$x^4 + y^4$

$-4ab$

$2(a^2 - b^2)$

$4ab$

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