Simplify square root of 25- square root of -4+ square root of 9- square root of -81

$\sqrt{25} - \sqrt{- 4} + \sqrt{9} - \sqrt{- 81}$

Simplify each term.

Rewrite $25$ as $5^{2}$ .

$\sqrt{5^{2}} - \sqrt{- 4} + \sqrt{9} - \sqrt{- 81}$

Pull terms out from under the radical, assuming positive real numbers.

$5 - \sqrt{- 4} + \sqrt{9} - \sqrt{- 81}$

Rewrite $- 4$ as $- 1 (4)$ .

$5 - \sqrt{- 1 (4)} + \sqrt{9} - \sqrt{- 81}$

Rewrite $\sqrt{- 1 (4)}$ as $\sqrt{- 1} \cdot \sqrt{4}$ .

$5 - (\sqrt{- 1} \cdot \sqrt{4}) + \sqrt{9} - \sqrt{- 81}$

Rewrite $\sqrt{- 1}$ as $i$ .

$5 - (i \cdot \sqrt{4}) + \sqrt{9} - \sqrt{- 81}$

Rewrite $4$ as $2^{2}$ .

$5 - (i \cdot \sqrt{2^{2}}) + \sqrt{9} - \sqrt{- 81}$

Pull terms out from under the radical, assuming positive real numbers.

$5 - (i \cdot 2) + \sqrt{9} - \sqrt{- 81}$

Move $2$ to the left of $i$ .

$5 - (2 \cdot i) + \sqrt{9} - \sqrt{- 81}$

Multiply $2$ by $- 1$ .

$5 - 2 i + \sqrt{9} - \sqrt{- 81}$

Rewrite $9$ as $3^{2}$ .

$5 - 2 i + \sqrt{3^{2}} - \sqrt{- 81}$

Pull terms out from under the radical, assuming positive real numbers.

$5 - 2 i + 3 - \sqrt{- 81}$

Rewrite $- 81$ as $- 1 (81)$ .

$5 - 2 i + 3 - \sqrt{- 1 (81)}$

Rewrite $\sqrt{- 1 (81)}$ as $\sqrt{- 1} \cdot \sqrt{81}$ .

$5 - 2 i + 3 - (\sqrt{- 1} \cdot \sqrt{81})$

Rewrite $\sqrt{- 1}$ as $i$ .

$5 - 2 i + 3 - (i \cdot \sqrt{81})$

Rewrite $81$ as $9^{2}$ .

$5 - 2 i + 3 - (i \cdot \sqrt{9^{2}})$

Pull terms out from under the radical, assuming positive real numbers.

$5 - 2 i + 3 - (i \cdot 9)$

Move $9$ to the left of $i$ .

$5 - 2 i + 3 - (9 \cdot i)$

Multiply $9$ by $- 1$ .

$5 - 2 i + 3 - 9 i$

Simplify by adding terms.

Add $5$ and $3$ .

$8 - 2 i - 9 i$

Subtract $9 i$ from $- 2 i$ .

$8 - 11 i$