The expression is .

First group the coefficients and variables.

(m⁵)(– 4m⁶) = (1 · (– 4))(m⁵ · m⁶)

= (– 4)(m⁵ · m⁶)            (Multiply:  1· (– 4) = – 4)

Since base is common, apply the product of powers property: a^m · aⁿ = a^{m + n}.

= ( – 4)(m^{5 + 6})

= – 4m¹¹                        (Add exponents: 5 + 6 = 11)

The product of (m⁵)(– 4m⁶) is – 4m¹¹.