Question 62253
(2x+3y)^3
(2x+3y)(2x+3y)(2x+3y)  Work the last two parentheses first.
(2x+3y)[2x(2x+3y)+3y(2x+3y)]
(2x+3y)[2x(2x)+2x(3y)+3y(2x)+3y(3y)]
{{{(2x+3y)(4x^2+6xy+6xy+9y^2)}}}
{{{(2x+3y)(4x^2+12xy+9y^2)}}}  
Now distribute the first term in the first parentheses through the second parentheses, then the second term in the first parentheses into the second parentheses.
{{{2x(4x^2+12xy+9y^2)+3y(4x^2+12xy+9y^2)}}}
{{{8x^3+24x^2y+18xy^2+12x^2y+36xy^2+27y^3}}}
{{{8x^3+24x^2y+12x^2y+18xy^2+36xy^2+27y^3}}}
{{{8x^3+36x^2y+54xy^2+27y^3}}}
Happy Calculating!!!