One mark exercise problems II — task. Mathematics State Board, Class 8.

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1. \((p + q)(p^2 - pq + q^2)\) is equal to

\(p^3 + q^3\)
\((p + q)^3\)
\(p^3 - q^3\)
\((p - q)^3\)

2. \((a - b) = 3\) and \(ab = 5\) then \(a^3 - b^3 =\) .

3. \(a^3 + b^3 = (a + b)^3 -\) ______

\(3ab(a + b)\)
\(3a(a + b)\)
\(-3ab(a + b)\)
\(3ab(a - b)\)

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