\(-8 (5 x + 2 y) = -40 x - 16 y\)

\(8 (9 p + 2) = 72 p + 16\)

\(9 (-3 a + 2 b + 7) = -27 a + 18 b + 63\)

\(2 (-4 x + 9) + 3 (-7 x - 5) = -8 x + 18 - 21 x - 15 = -29 x + 3\)

\(-5 a (9 a + 6) = -45 a^{2} - 30 a\)

\(3 + (6 x - 7) = 3 + 6 x - 7 = 6 x - 4\)

\(9 - (-8 a + 3) = 9 + 8 a - 3 = 8 a + 6\)

\((5 a - 7) (-3 b - 4) = -15 a b - 20 a + 21 b + 28\)

\((6 p - 3) (-4 p - 9) = -24 p^{2} - 54 p + 12 p + 27 = -24 p^{2} - 42 p + 27\)

\((x + 3) (x - 7) = x^{2} - 7 x + 3 x - 21 = x^{2} - 4 x - 21\)

\((3 x + 2) + (5 x + 7) = 3 x + 2 + 5 x + 7 = 8 x + 9\)

\((-7 a - 3) - (8 a - 4) = -7 a - 3 + -8 a + 4 = -15 a + 1\)

\((x - 2) (x + 5) (x - 7) = (x - 2) (x^{2} - 2 x - 35) = x^{3} - 2 x^{2} - 35 x - 2 x^{2} + 4 x + 70 = x^{3} - 4 x^{2} - 31 x + 70\)

\(x (x + 8) (x + 3) = x (x^{2} + 11 x + 24) = x^{3} + 11 x^{2} + 24 x\)

\((a + 4)^{2} = a^{2} + 8 a + 16\)

\((3 p + 6)^{2} = 9 p^{2} + 36 p + 36\)

\((-8 a - 4 b)^{2} = 64 a^{2} + 64 a b + 16 b^{2}\)

\((5 x + 9 y) (5 x - 9 y) = 25 x^{2} - 81 y^{2}\)

\((8 p - 7) (8 p + 7) = 64 p^{2} - 49\)

\((a + 7) (a - 7) = a^{2} - 49\)