x^2+16x=276

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Solution for x^2+16x=276 equation:


Simplifying
x2 + 16x = 276

Reorder the terms:
16x + x2 = 276

Solving
16x + x2 = 276

Solving for variable 'x'.

Reorder the terms:
-276 + 16x + x2 = 276 + -276

Combine like terms: 276 + -276 = 0
-276 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '276' to each side of the equation.
-276 + 16x + 276 + x2 = 0 + 276

Reorder the terms:
-276 + 276 + 16x + x2 = 0 + 276

Combine like terms: -276 + 276 = 0
0 + 16x + x2 = 0 + 276
16x + x2 = 0 + 276

Combine like terms: 0 + 276 = 276
16x + x2 = 276

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = 276 + 64

Reorder the terms:
64 + 16x + x2 = 276 + 64

Combine like terms: 276 + 64 = 340
64 + 16x + x2 = 340

Factor a perfect square on the left side:
(x + 8)(x + 8) = 340

Calculate the square root of the right side: 18.439088915

Break this problem into two subproblems by setting 
(x + 8) equal to 18.439088915 and -18.439088915.

Subproblem 1

x + 8 = 18.439088915 Simplifying x + 8 = 18.439088915 Reorder the terms: 8 + x = 18.439088915 Solving 8 + x = 18.439088915 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 18.439088915 + -8 Combine like terms: 8 + -8 = 0 0 + x = 18.439088915 + -8 x = 18.439088915 + -8 Combine like terms: 18.439088915 + -8 = 10.439088915 x = 10.439088915 Simplifying x = 10.439088915

Subproblem 2

x + 8 = -18.439088915 Simplifying x + 8 = -18.439088915 Reorder the terms: 8 + x = -18.439088915 Solving 8 + x = -18.439088915 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = -18.439088915 + -8 Combine like terms: 8 + -8 = 0 0 + x = -18.439088915 + -8 x = -18.439088915 + -8 Combine like terms: -18.439088915 + -8 = -26.439088915 x = -26.439088915 Simplifying x = -26.439088915

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.439088915, -26.439088915}

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