\(-3 (2 a + 6 b) = -6 a - 18 b\)

\(-3 + (2 p - 9) = -3 + 2 p - 9 = 2 p - 12\)

\(8 - (7 x + 2) = 8 - 7 x - 2 = -7 x + 6\)

\(9 (2 a - 8) = 18 a - 72\)

\(3 (8 x + 7) - 2 (6 x + 4) = 24 x + 21 - 12 x - 8 = 12 x + 13\)

\(9 a (5 a - 2) = 45 a^{2} - 18 a\)

\((-8 x + 6) + (4 x + 3) = -8 x + 6 + 4 x + 3 = -4 x + 9\)

\((-2 p - 7) - (5 p - 8) = -2 p - 7 + -5 p + 8 = -7 p + 1\)

\(2 (7 a - 6 b + 9) = 14 a - 12 b + 18\)

\((-3 p + 9) (-2 q - 7) = 6 p q + 21 p - 18 q - 63\)

\((5 x - 2) (9 x - 6) = 45 x^{2} - 30 x - 18 x + 12 = 45 x^{2} - 48 x + 12\)

\((a - 5) (a + 9) = a^{2} + 9 a - 5 a - 45 = a^{2} + 4 a - 45\)

\((x + 1)^{2} = x^{2} + 2 x + 1\)

\((5 a + 6)^{2} = 25 a^{2} + 60 a + 36\)

\((4 p + 7 q)^{2} = 16 p^{2} + 56 p q + 49 q^{2}\)

\((x - 9) (x - 6) (x - 7) = (x - 9) (x^{2} - 13 x + 42) = x^{3} - 13 x^{2} + 42 x - 9 x^{2} + 117 x - 378 = x^{3} - 22 x^{2} + 159 x - 378\)

\(a (a - 5) (a - 6) = a (a^{2} - 11 a + 30) = a^{3} - 11 a^{2} + 30 a\)

\((6 a - 4 b) (6 a + 4 b) = 36 a^{2} - 16 b^{2}\)

\((-6 x + 9) (-6 x - 9) = 36 x^{2} - 81\)

\((p - 2) (p + 2) = p^{2} - 4\)