5x^3y(x-y)^3-10x^4y^3(y-x)^2

5x^3y(x-y)^3-10x^4y^3(y-x)^2

5x^3y(x-y)^3-10x^4y^3(y-x)^2
=5x³y(x-y)³-10x^4y³(x-y)²
=5x³y(x-y)²(x-y-2xy²)

1. Let the random variables X and y be independent, n (0,1), n (1,4), let z = 2x-y + 3, find the expected e (z) and variance D (z) of Z,
Hope that the God gives specific steps to solve the problem

E(Z)=E(2X-Y+3)=2E(X)-E(Y)+3=2
D(Z)=4D(X)+D(Y)=8
If you have any suggestions, you are welcome to discuss and learn together,

Let X and y be independent of each other, n (1,4), B (10,0.4), then d (2x-y) =?

D(X)=4
D(Y)=10*0.6*0.4=2.4
D(2X-Y)=4D(X)+D(Y)=16+2.4=12.4
If you have any suggestions, you are welcome to discuss and learn together,