Subtract (7h^3+8h)-(9h^3+h^2-2h)

$(7 h^{3} + 8 h) - (9 h^{3} + h^{2} - 2 h)$

Simplify each term.

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Apply the distributive property.

$7 h^{3} + 8 h - (9 h^{3}) - h^{2} - (- 2 h)$

Simplify.

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Multiply $9$ by $- 1$ .

$7 h^{3} + 8 h - 9 h^{3} - h^{2} - (- 2 h)$

Multiply $- 2$ by $- 1$ .

$7 h^{3} + 8 h - 9 h^{3} - h^{2} + 2 h$

Simplify by adding terms.

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Subtract $9 h^{3}$ from $7 h^{3}$ .

$- 2 h^{3} + 8 h - h^{2} + 2 h$

Add $8 h$ and $2 h$ .

$- 2 h^{3} - h^{2} + 10 h$

Subtract (7h^3+8h)-(9h^3+h^2-2h)

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