# Span

**Geometry**Level pending

If the sum of the magnitudes of coefficient of x, y and z of span of two vectors v1 and v2 expressed as a set of coefficient of unit vectors i , j and k as (7,8,9) and (3,-5,4) respectively is expressed in the form of pi(e^(e^(e^((a^b)pi)))), then a+b = ?