If →a=^i+^j and →b=−^j+2^k. Find (→a−→b).(→a+2→b).

1.	If →a=^i+^j and →b=−^j+2^k. Find (→a−→b).(→a+2→b).
Answer» If $\to a =^i +^j$ and $\to b = -^j + 2^k$ . Find $(\to a - \to b) . (\to a + 2 \to b)$ .

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If →a=^i+^j and →b=−^j+2^k. Find (→a−→b).(→a+2→b).

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