If a^{\to} = xi^{\^}+2j^{\^}-zk^{\^} and b^{\to} = ...

CBSE Class 12 Math 2013 Solved Paper

Question : 7 of 29

Marks: +1, -0

a↖{→}

xi↖{\^}+2j↖{\^}-zk↖{\^}

and

b↖{→}

3i↖{\^}-yj↖{\^}+k↖{\^}

are two equal vectors, then write the value of x + y + z

Solution:

Given,

a↖{→}

xi↖{\^}+2j↖{\^}-zk↖{\^}

and

b↖{→}

3i↖{\^}-yj↖{\^}+k↖{\^}

are equal vectors.
∴

xi↖{\^}+2j↖{\^}-zk↖{\^}

3i↖{\^}-yj↖{\^}+k↖{\^}

⇒ x = 3 , y = - 2 , z = - 1
∴ x + y + z = 3 + (- 2) + (- 1) = 0

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