What is expand Re(x+y)^4 ?

The solution to expand Re(x+y)^4 is eRx^4+4eRx^3y+6eRx^2y^2+4eRxy^3+eRy^4

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expand Re(x+y)^4

expand

R e (x + y)^{4}

e R x^{4} + 4 e R x^{3} y + 6 e R x^{2} y^{2} + 4 e R x y^{3} + e R y^{4}

Solution steps

R e (x + y)^{4}

(x + y)^{4} = x^{4} + 4 x^{3} y + 6 x^{2} y^{2} + 4 x y^{3} + y^{4}

= e R (x^{4} + 4 x^{3} y + 6 x^{2} y^{2} + 4 x y^{3} + y^{4})

= e R (x^{4} + 4 x^{3} y + 6 x^{2} y^{2} + 4 x y^{3} + y^{4})

Distribute parentheses

= R e x^{4} + R e 4 x^{3} y + R e 6 x^{2} y^{2} + R e 4 x y^{3} + R e y^{4}

= e R x^{4} + 4 e R x^{3} y + 6 e R x^{2} y^{2} + 4 e R x y^{3} + e R y^{4}

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What is expand Re(x+y)^4 ?
The solution to expand Re(x+y)^4 is eRx^4+4eRx^3y+6eRx^2y^2+4eRxy^3+eRy^4