6((2a + b )× b - a² ) - 2(a+b)( a - 2b ) + 2a (4a - 7b )

Question

6((2a + b )× b - a² ) - 2(a+b)( a - 2b ) + 2a (4a - 7b )

Answer 1

6(2ab+b^2-a^2)-2(a^2-2ab+ab-2b^2)+8a^2-14ab=
12ab+6b^2-6a^2-2a^2+2ab+4b^2+8a^2-14ab=
10b^2