Calculate: 6⁢x^7+21⁢x^6+15⁢x^5

Expression: $6⁢x^{7} + 21⁢x^{6} + 15⁢x^{5}$

Alternate forms

$3⁢x^{5}⁢\left(x + 1\right)⁢\left(2⁢x + 5\right)$