Даны векторы 𝑎 → ( 6 ; 4 ) ${\displaystyle \stackrel{\to }{a}\left(6;4\right)}$ и 𝑏 → ( 5 ; − 7 ) . ${\displaystyle \stackrel{\to }{b}\left(5;-7\right).}$ Найдите скалярное произведение 𝑎 → ⋅ 𝑏 → . ${\displaystyle \stackrel{\to }{a}\cdot \stackrel{\to }{b}.}$