Calculate Scalar Product

New Numbers

Let (V,,)(V, \langle \cdot, \cdot \rangle) an Euclidean vector space and v,uVv, u \in V with v,u=4{\color{blue}\langle v,u \rangle = -4}.

Determine the value of the scalar product 8v,6u\langle -8v, -6u \rangle.