Simplify (2a^2b^2+3ab^2-5a^2b)-(3a^2b^2-9a^2b+7ab^2)

$(2 a^{2} b^{2} + 3 a b^{2} - 5 a^{2} b) - (3 a^{2} b^{2} - 9 a^{2} b + 7 a b^{2})$

Simplify each term.

Apply the distributive property.

$2 a^{2} b^{2} + 3 a b^{2} - 5 a^{2} b - (3 a^{2} b^{2}) - (- 9 a^{2} b) - (7 a b^{2})$

Simplify.

Multiply $3$ by $- 1$ .

$2 a^{2} b^{2} + 3 a b^{2} - 5 a^{2} b - 3 (a^{2} b^{2}) - (- 9 a^{2} b) - (7 a b^{2})$

Multiply $- 9$ by $- 1$ .

$2 a^{2} b^{2} + 3 a b^{2} - 5 a^{2} b - 3 (a^{2} b^{2}) + 9 (a^{2} b) - (7 a b^{2})$

Multiply $7$ by $- 1$ .

$2 a^{2} b^{2} + 3 a b^{2} - 5 a^{2} b - 3 (a^{2} b^{2}) + 9 (a^{2} b) - 7 (a b^{2})$

Remove parentheses.

$2 a^{2} b^{2} + 3 a b^{2} - 5 a^{2} b - 3 a^{2} b^{2} + 9 a^{2} b - 7 a b^{2}$

Simplify by adding terms.

Subtract $3 a^{2} b^{2}$ from $2 a^{2} b^{2}$ .

$- a^{2} b^{2} + 3 a b^{2} - 5 a^{2} b + 9 a^{2} b - 7 a b^{2}$

Subtract $7 a b^{2}$ from $3 a b^{2}$ .

$- a^{2} b^{2} - 4 a b^{2} - 5 a^{2} b + 9 a^{2} b$

Add $- 5 a^{2} b$ and $9 a^{2} b$ .

$- a^{2} b^{2} - 4 a b^{2} + 4 a^{2} b$