Solve for d d^2=81

$d^{2} = 81$

Take the square root of both sides of the equation to eliminate the exponent on the left side.

$d = \pm \sqrt{81}$

Simplify $\pm \sqrt{81}$ .

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

$d = \pm \sqrt{9^{2}}$

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

$d = \pm 9$

The complete solution is the result of both the positive and negative portions of the solution.

First, use the positive value of the $\pm$ to find the first solution.

$d = 9$

Next, use the negative value of the $\pm$ to find the second solution.

$d = - 9$

The complete solution is the result of both the positive and negative portions of the solution.

$d = 9, - 9$