Two vectors have magnitudes 6 units and 8 units, respectively. Find magnitude of resultant of two vectors if angle between two vectors is 180°

Magnitude of vector A=6 Units. Magnitude of vector B=8 units.Now resultant =|A+B| will be equal to A2+B2+2ABcos(θ)when angle between them is 180 degree:Then |A+B|=62+82+(2)(6)(8)cos(180)=100-96( since cos(180) =-1)=2 units