(x+5y) at cube how you do th

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Are you looking for (x+5y) cubed?  (x+5y)^3 = (x + 5y)*(x+5y)*(x+5y)                = (x^2 + 5xy + 5xy + 25y^2)*(x+5y)                = (x^2 +10xy + 25y^2)*(x+5y)                = x^3 + 5(x^2)y + 10(x^2)y + 50xy^2 + 25xy^2 + 125y^3                = x^3 + 15x^2y + 75xy^2 + 125y^3Just remember that when multiplying parentheses with more than one term by another parentheses, all the things in each group, must multiply all the things in the other.  So I just take the first group of things, and one by one I multiply each thing to each thing in the second group.