Let three vectors →a,→b and →c be such that →c is coplanar wit – InterviewSolution

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1.	Let three vectors →a,→b and →c be such that →c is coplanar with →a and →b, →a.→c=7 and →b is perpendicular to →c, where →a=−^i+^j+^k and →b=2^i+^k, then the value of 2\|→a+→b+→c\|2 is
Answer» Let three vectors $\to a, \to b$ and $\to c$ be such that $\to c$ is coplanar with $\to a$ and $\to b, \to a . \to c = 7$ and $\to b$ is perpendicular to $\to c,$ where $\to a = -^i +^j +^k$ and $\to b = 2^i +^k$ , then the value of $2 \| \to a + \to b + \to c \|^{2}$ is

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