Solve by Completing the Square x^2-16x+64=0

$x^{2} - 16 x + 64 = 0$

Step 1

Subtract $64$ from both sides of the equation.

$x^{2} - 16 x = - 64$

Step 2

To create a trinomial square on the left side of the equation, find a value that is equal to the square of half of $b$ .

${(\frac{b}{2})}^{2} = {(- 8)}^{2}$

Step 3

Add the term to each side of the equation.

$x^{2} - 16 x + {(- 8)}^{2} = - 64 + {(- 8)}^{2}$

Step 4

Simplify the equation.

Simplify the left side.

Raise $- 8$ to the power of $2$ .

$x^{2} - 16 x + 64 = - 64 + {(- 8)}^{2}$

Simplify the right side.

Simplify $- 64 + {(- 8)}^{2}$ .

Raise $- 8$ to the power of $2$ .

$x^{2} - 16 x + 64 = - 64 + 64$

Add $- 64$ and $64$ .

$x^{2} - 16 x + 64 = 0$

Step 5

Factor the perfect trinomial square into ${(x - 8)}^{2}$ .

${(x - 8)}^{2} = 0$

Step 6

Solve the equation for $x$ .

Set the $x - 8$ equal to $0$ .

$x - 8 = 0$

Add $8$ to both sides of the equation.

$x = 8$