Solve for: (-9x^4)(-3x)

Expression: (-9x^4)(-3x)

Write the problem as a mathematical expression

$\left( - 9x^{4}\right)\left( - 3x\right)$

Rewrite using the commutative property of multiplication

$ - 9 \cdot - 3x^{4}x$

Move $x$

$ - 9 \cdot - 3\left(x \cdot x^{4}\right)$

Raise $x$

$ - 9 \cdot - 3\left(x^{1}x^{4}\right)$

Use the power rule $a^{m}a^{n} = a^{m + n}$

$ - 9 \cdot - 3x^{1 + 4}$

Add $1$

$ - 9 \cdot - 3x^{5}$

Multiply $ - 9$

$27x^{5}$