(a + b) * (2a-b) = 2a^2 - ab + 2ab - b^2 = 2a^2 + ab - b^2
(2c - d) * (c+1) = 2c^2 + 2c - cd - d
(a^2 + a + 1) * (6a-1) = 6a^3 - a^2 + 6a^2 - a + 6a - 1 = 6a^3 + 5a^2 + 5a - 1
(x^3 - x^2 - x) (x+2) = x^4 + 2x^3 - x^3 - 2x^2 - 2x - x^2 = x^4 + x^3 - 3x^2 - 2x
(-3x - 2y) (x+y) = -3x^2 - 3xy - 2xy - 2y^2 = -3x^2 - 5xy - 2y^2
(4x + y - 1) * (x+y+1) = 4x^2 + 4xy + 4x + xy + y^2 + y - x - y - 1 = 4x^2 + 5xy + 3x + y^2 - 1
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(a + b) * (2a-b) = 2a^2 - ab + 2ab - b^2 = 2a^2 + ab - b^2
(2c - d) * (c+1) = 2c^2 + 2c - cd - d
(a^2 + a + 1) * (6a-1) = 6a^3 - a^2 + 6a^2 - a + 6a - 1 = 6a^3 + 5a^2 + 5a - 1
(x^3 - x^2 - x) (x+2) = x^4 + 2x^3 - x^3 - 2x^2 - 2x - x^2 = x^4 + x^3 - 3x^2 - 2x
(-3x - 2y) (x+y) = -3x^2 - 3xy - 2xy - 2y^2 = -3x^2 - 5xy - 2y^2
(4x + y - 1) * (x+y+1) = 4x^2 + 4xy + 4x + xy + y^2 + y - x - y - 1 = 4x^2 + 5xy + 3x + y^2 - 1