How to solve this problem from vector algebra?

Question

higher mathematics

An example is given:

a = 3i+ 4j - 8k, b = 2i - 6j - 3k, c = 2i + j - 3k. Определить (a×b)·c.

How is it possible to find a solution? PS I couldn't find a clear answer on the internet.

Answer 1

I didn't find a clear answer on the internet.

These two links are enough to solve:
https://ru.wikipedia.org/wiki/Vector_Product
https://ru.wikipedia.org/wiki/Scalar_Product
Ah, I figured out what was wrong.
i,j,k is the basis . If the vectors i,j,k are not given explicitly, then just count as if a = (3, 4, -8), instead of a = 3i + 4j - 8k.