x^2+14x=99

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Solution for x^2+14x=99 equation:


Simplifying
x2 + 14x = 99

Reorder the terms:
14x + x2 = 99

Solving
14x + x2 = 99

Solving for variable 'x'.

Reorder the terms:
-99 + 14x + x2 = 99 + -99

Combine like terms: 99 + -99 = 0
-99 + 14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '99' to each side of the equation.
-99 + 14x + 99 + x2 = 0 + 99

Reorder the terms:
-99 + 99 + 14x + x2 = 0 + 99

Combine like terms: -99 + 99 = 0
0 + 14x + x2 = 0 + 99
14x + x2 = 0 + 99

Combine like terms: 0 + 99 = 99
14x + x2 = 99

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = 99 + 49

Reorder the terms:
49 + 14x + x2 = 99 + 49

Combine like terms: 99 + 49 = 148
49 + 14x + x2 = 148

Factor a perfect square on the left side:
(x + 7)(x + 7) = 148

Calculate the square root of the right side: 12.165525061

Break this problem into two subproblems by setting 
(x + 7) equal to 12.165525061 and -12.165525061.

Subproblem 1

x + 7 = 12.165525061 Simplifying x + 7 = 12.165525061 Reorder the terms: 7 + x = 12.165525061 Solving 7 + x = 12.165525061 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 12.165525061 + -7 Combine like terms: 7 + -7 = 0 0 + x = 12.165525061 + -7 x = 12.165525061 + -7 Combine like terms: 12.165525061 + -7 = 5.165525061 x = 5.165525061 Simplifying x = 5.165525061

Subproblem 2

x + 7 = -12.165525061 Simplifying x + 7 = -12.165525061 Reorder the terms: 7 + x = -12.165525061 Solving 7 + x = -12.165525061 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -12.165525061 + -7 Combine like terms: 7 + -7 = 0 0 + x = -12.165525061 + -7 x = -12.165525061 + -7 Combine like terms: -12.165525061 + -7 = -19.165525061 x = -19.165525061 Simplifying x = -19.165525061

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.165525061, -19.165525061}

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