If →a and →b are vectors such that |→a+→b|=√29 and →a×(2^i+3^j+4^k)=(2^i+3^j+4^k)×→b, then a possible value of (→a+→b)⋅(−7^i+2^j+3^k) is

If →a and →b are vectors such that |→a+→b|=√29 and →a×(2^

1.	If →a and →b are vectors such that \|→a+→b\|=√29 and →a×(2^i+3^j+4^k)=(2^i+3^j+4^k)×→b, then a possible value of (→a+→b)⋅(−7^i+2^j+3^k) is
Answer» If $\to a$ and $\to b$ are vectors such that $\| \to a + \to b \| = \sqrt{29}$ and $\to a \times (2^i + 3^j + 4^k) = (2^i + 3^j + 4^k) \times \to b,$ then a possible value of $(\to a + \to b) \cdot (- 7^i + 2^j + 3^k)$ is