1.

Consider the vectors "" oversetrarra=2overset^^i-3overset^^j+overset^^k"and"oversetrarrb = overset^^i+overset^^j-2overset^^k. ""Find |3 oversetrarra+oversetrarrb |

Answer»

SOLUTION :`3veca+vecb=6overset^^i-9overset^^j3overset^^k)+(overset^^i+overset^^j-2overset^^k)`
`7overset^^i-8overset^^j+overset^^k`
`implies|3veca+vecb|=SQRT(49+64+1)=sqrt(114)`


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