if p= 1aa -3ab+4bb ,q=6aa+7ab-5bb , r= 1aa-4bb+8ab find 3p-4q+2r
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p=1aa - 3ab + 4bb
so
3p =3aa - 9ab + 12bb ---1
q=6aa + 7ab - 5bb
so
4q = 24aa + 28ab - 20bb ---2
r=1aa + 8ab - 4bb
so
2r=2aa + 16ab - 8bb ---3
we are to calculate 3p - 4q + 2r
so add eq. 1 , 2 and 3
we get
3aa -9ab + 12bb - 24aa - 28ab + 20bb + 2aa + 16ab - 8bb
= -19aa -21ab + 24bb
so
3p =3aa - 9ab + 12bb ---1
q=6aa + 7ab - 5bb
so
4q = 24aa + 28ab - 20bb ---2
r=1aa + 8ab - 4bb
so
2r=2aa + 16ab - 8bb ---3
we are to calculate 3p - 4q + 2r
so add eq. 1 , 2 and 3
we get
3aa -9ab + 12bb - 24aa - 28ab + 20bb + 2aa + 16ab - 8bb
= -19aa -21ab + 24bb
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