Write in Standard Form 5+ square root of -16

$5 + \sqrt{- 16}$

To write a polynomial in standard form, simplify and then arrange the terms in descending order.

$a x^{2} + b x + c$

Simplify each term.

Rewrite $- 16$ as $- 1 (16)$ .

$5 + \sqrt{- 1 (16)}$

Rewrite $\sqrt{- 1 (16)}$ as $\sqrt{- 1} \cdot \sqrt{16}$ .

$5 + \sqrt{- 1} \cdot \sqrt{16}$

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

$5 + i \cdot \sqrt{16}$

Rewrite $16$ as $4^{2}$ .

$5 + i \cdot \sqrt{4^{2}}$

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

$5 + i \cdot 4$

Move $4$ to the left of $i$ .

$5 + 4 i$