Multiple choice questions — task. Mathematics State Board, Class 9.

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1. \((x + y)(x^2 - xy + y^2)\) is equal to

\((x^3 - y^3)\)
\((x - y)^3\)
\((x + y)^3\)
\((x^3 + y^3)\)

2. \((a + b - c)^2\) is equal to

\((a + b + c)^2\)
\((-a - b + c)^2\)
\((a - b - c)^2\)
\((a - b + c)^2\)

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