`A=2hat(i)+hat(j),B+3hat(j)-hat(k)and C=6hat(i)-2hat(k)` Value of `A-2B+3C` would be
`A=2hat(i)+hat(j),B+3hat(j)-hat(k)and C=6hat(i)-2hat(k)` Value of `A-2B+3C` would be
A. `20hat(i)+5hat(j)+4hat(j)`
B. `20hat(i)-5hat(j)-4hat(k)`
C. `4hat(i)+5hat(j)+20hat(k)`
D. `5hat(i)+4hat(j)+10hat(k)`
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Correct Answer - B
(b)`A=2hat(i)+hat(j),B=3hat(j)-hat(k)andC=6hat(i)-2hat(k),`
`A-2B+3C=(2hat(i)+hat(j))-2(3hat(j)-hat(k))+3(6hat(i)-2hat(k))`
`=2hat(i)+hat(j)-6hat(j)+2hat(k)+18hat(i)-6hat(k)`
`=20hat(i)-5hat(j)-4hat(k)`
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