How do you simplify 4a*3b*7c^2?

$4 a \cdot 3 b \cdot 7 {c}^{2} = \left(4 \cdot 3 \cdot 7\right) \left(a \cdot b \cdot {c}^{2}\right) = 84 \cdot a b {c}^{2} = 84 a b {c}^{2}$