Solve by Completing the Square x^2+14x+49=0

$x^{2} + 14 x + 49 = 0$

Step 1

Subtract $49$ from both sides of the equation.

$x^{2} + 14 x = - 49$

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 $b$ .

${(\frac{b}{2})}^{2} = {(7)}^{2}$

Step 3

Add the term to each side of the equation.

$x^{2} + 14 x + {(7)}^{2} = - 49 + {(7)}^{2}$

Step 4

Simplify the equation.

Simplify the left side.

Raise $7$ to the power of $2$ .

$x^{2} + 14 x + 49 = - 49 + {(7)}^{2}$

Simplify the right side.

Simplify $- 49 + {(7)}^{2}$ .

Raise $7$ to the power of $2$ .

$x^{2} + 14 x + 49 = - 49 + 49$

Add $- 49$ and $49$ .

$x^{2} + 14 x + 49 = 0$

Step 5

Factor the perfect trinomial square into ${(x + 7)}^{2}$ .

${(x + 7)}^{2} = 0$

Step 6

Solve the equation for $x$ .

Set the $x + 7$ equal to $0$ .

$x + 7 = 0$

Subtract $7$ from both sides of the equation.

$x = - 7$