[√3y+(√7 + 2√3y)] x (√7+√3x) = ?
[√3y+(√7 + 2√3y)] x (√7+√3x) = (√3y+√7+2√3y) x (√7+√3x)=
= (3√3y+√7)(√7+√3x)= 3√21y+3√9xy+√49+√21x= 3√21y + √21x + 9xy + 7
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[√3y+(√7 + 2√3y)] x (√7+√3x) = (√3y+√7+2√3y) x (√7+√3x)=
= (3√3y+√7)(√7+√3x)= 3√21y+3√9xy+√49+√21x= 3√21y + √21x + 9xy + 7