Даны векторы 𝑎 → ( 8 ; 9 ) ${\displaystyle \stackrel{\to }{a}\left(8;9\right)}$ и 𝑏 → ( 4 ; − 3 ) . ${\displaystyle \stackrel{\to }{b}\left(4;-3\right).}$ Найдите скалярное произведение 𝑎 → ⋅ 𝑏 → . ${\displaystyle \stackrel{\to }{a}\cdot \stackrel{\to }{b}.}$