``
``
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all17
[es104]
444.16
$5(5x+2y)^4+25(5x+2y)^3x=$
5(5x+2y^3[(5x+2y)+5x]=$
5(5x+2y)^3[10x+2y]$
10(5x+2y)^3(5x+y)$
`ax(x^2+y^2)+ax^2(x+y)=`
`=ax^3+axy^2+ax^3+ax^2y=`
`=2ax^3+axy^2+ax^2y=`
`=ax(2x^2+y^2+xy)`
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