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(x y) 7 = x 7 7x 6 y 21x 5 y 2 35x 4 y 3 35x 3 y 4 21x 2 y 5 7xy 6 y 7 When the terms of the binomial have coefficient(s), be sure to apply the exponents to these coefficients Example Write out the expansion of (2 x 3 y ) 44 \\ \end{bmatrix}}$ $\times$ ${\begin{bmatrix} 6 &3 For any region Rof 2D space P((X;Y) 2R) = Z Z R fXY(x;y) dxdy For when the rv's are continuous 16 Example Movement of a particle An article describes a model for the movement of a particle Assume that a particle moves within the region Abounded by the x Simplify X Y 3 X Y 3 6y X 2 Y 2 Xy3z2