Simplify -9x^4y(-2y)

$- 9 x^{4} y (- 2 y)$

Multiply $y$ by $y$ by adding the exponents.

Move $y$ .

$- 9 x^{4} (y \cdot y) \cdot - 2$

Multiply $y$ by $y$ .

$- 9 x^{4} y^{2} \cdot - 2$

$- 9 x^{4} y^{2} \cdot - 2$

Multiply $- 2$ by $- 9$ .

$18 x^{4} y^{2}$

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