Trilinear functions are indeed extensions of linear functions to three dimensions, represented mathematically as f(x,y,z) = 3x - 2y + 4z. Triquadratic functions extend quadratic functions into three dimensions, with examples including g(x,y,z) = x^2 + y^2 + z^2 and h(x,y,z) = xy + yz + xz. Both types of functions are crucial for modeling multidimensional relationships in various fields. Understanding these functions enhances comprehension of higher-dimensional calculus and geometry. This knowledge is essential for applications in physics, engineering, and computer graphics.