यदि ` veca = hati - 7 hatj + 7 hatk ` और ` vecc = 3 hati - 2 hatj +2 hatk ` तो ` | veca xx vecb |` ज्ञात कीजिए ।

Explanation

दिया है `veca = hati - 7 hatj + 7 hatk `
तथा ` vecb = 3 hati - 2 hatj + 2 hatk + 2 hatk`
` veca xxvecb =|{:( hati, hatj , hatk),( 1,-7,7),( 3,-2,2):}|`
` =( -14 + 14) hati ( 2 - 21 ) hatj + ( -2 + 21 ) hatk`
`=0 hati + 19 hatj +19 hatk`
`=? |vecaxxvecb| = sqrt( 0^(2) +(19)^(2) + (19) ^(2))`
` = sqrt( 2xx(19) ^(2) )= 19 sqrt(2) `