(x+8)⋅(x+5) = x^2 + 5x + 8x + 40 = x^2 + 13x + 40
(4d^2−3)(3d^2+9) = 4d^2 3d^2 + 4d^2 9 - 3 3d^2 - 3 9= 12d^4 + 36d^2 - 9d^2 - 27= 12d^4 + 27d^2 - 27
(x+8)⋅(x+5) = x^2 + 5x + 8x + 40 = x^2 + 13x + 40
(4d^2−3)(3d^2+9) = 4d^2 3d^2 + 4d^2 9 - 3 3d^2 - 3 9
= 12d^4 + 36d^2 - 9d^2 - 27
= 12d^4 + 27d^2 - 27