Find `vecaxxvecb and |vecaxxvecb|` if `vec=hati-7hatj+7hatk vecb=3hati-2hat+2hatk``

Explanation

`veca=hati-7hatjandvecb=3hati+2hatk`
`vecaxxvecb=|{:(hati,hatj,hatk),(1,-7,7),(3,-2,2):}|`
`= hati(-14+14)-hatj(2-21)+hatk(-2+21)=19hatj+19hatk`
`|vecaxxvecb|=sqrt((19)^(2)+(19)^(2))=sqrt(2xx(19)^(2))=19sqrt2`