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If the vectors $\vec{A} = (a \hat{i} - a \hat{j} + \hat{k}) a n d \vec{B} = (a \hat{i} + \hat{j} - 2)$ are mutually perpendicular, then positive value of ‘a’ is

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Correct option is A

(1)A→. B→ = 0⇒ai^−aj^+k^ .ai^+j^−2=0⇒ a2−a−2=0 ⇒ a−2a+1=0 ⇒ a=2, −1

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If the vectors A→=ai^−aj^+k^ and B→=ai^+j^−2 are mutually perpendicular, then positive value of ‘a’ is

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If the vectors $\vec{A} = (a \hat{i} - a \hat{j} + \hat{k}) a n d \vec{B} = (a \hat{i} + \hat{j} - 2)$ are mutually perpendicular, then positive value of ‘a’ is