x^2+14x=256

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Solution for x^2+14x=256 equation:


Simplifying
x2 + 14x = 256

Reorder the terms:
14x + x2 = 256

Solving
14x + x2 = 256

Solving for variable 'x'.

Reorder the terms:
-256 + 14x + x2 = 256 + -256

Combine like terms: 256 + -256 = 0
-256 + 14x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '256' to each side of the equation.
-256 + 14x + 256 + x2 = 0 + 256

Reorder the terms:
-256 + 256 + 14x + x2 = 0 + 256

Combine like terms: -256 + 256 = 0
0 + 14x + x2 = 0 + 256
14x + x2 = 0 + 256

Combine like terms: 0 + 256 = 256
14x + x2 = 256

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 = 256 + 49

Reorder the terms:
49 + 14x + x2 = 256 + 49

Combine like terms: 256 + 49 = 305
49 + 14x + x2 = 305

Factor a perfect square on the left side:
(x + 7)(x + 7) = 305

Calculate the square root of the right side: 17.464249197

Break this problem into two subproblems by setting 
(x + 7) equal to 17.464249197 and -17.464249197.

Subproblem 1

x + 7 = 17.464249197 Simplifying x + 7 = 17.464249197 Reorder the terms: 7 + x = 17.464249197 Solving 7 + x = 17.464249197 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 = 17.464249197 + -7 Combine like terms: 7 + -7 = 0 0 + x = 17.464249197 + -7 x = 17.464249197 + -7 Combine like terms: 17.464249197 + -7 = 10.464249197 x = 10.464249197 Simplifying x = 10.464249197

Subproblem 2

x + 7 = -17.464249197 Simplifying x + 7 = -17.464249197 Reorder the terms: 7 + x = -17.464249197 Solving 7 + x = -17.464249197 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 = -17.464249197 + -7 Combine like terms: 7 + -7 = 0 0 + x = -17.464249197 + -7 x = -17.464249197 + -7 Combine like terms: -17.464249197 + -7 = -24.464249197 x = -24.464249197 Simplifying x = -24.464249197

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.464249197, -24.464249197}

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