x^2+16x=261

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Solution for x^2+16x=261 equation:


Simplifying
x2 + 16x = 261

Reorder the terms:
16x + x2 = 261

Solving
16x + x2 = 261

Solving for variable 'x'.

Reorder the terms:
-261 + 16x + x2 = 261 + -261

Combine like terms: 261 + -261 = 0
-261 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '261' to each side of the equation.
-261 + 16x + 261 + x2 = 0 + 261

Reorder the terms:
-261 + 261 + 16x + x2 = 0 + 261

Combine like terms: -261 + 261 = 0
0 + 16x + x2 = 0 + 261
16x + x2 = 0 + 261

Combine like terms: 0 + 261 = 261
16x + x2 = 261

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 = 261 + 64

Reorder the terms:
64 + 16x + x2 = 261 + 64

Combine like terms: 261 + 64 = 325
64 + 16x + x2 = 325

Factor a perfect square on the left side:
(x + 8)(x + 8) = 325

Calculate the square root of the right side: 18.027756377

Break this problem into two subproblems by setting 
(x + 8) equal to 18.027756377 and -18.027756377.

Subproblem 1

x + 8 = 18.027756377 Simplifying x + 8 = 18.027756377 Reorder the terms: 8 + x = 18.027756377 Solving 8 + x = 18.027756377 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 = 18.027756377 + -8 Combine like terms: 8 + -8 = 0 0 + x = 18.027756377 + -8 x = 18.027756377 + -8 Combine like terms: 18.027756377 + -8 = 10.027756377 x = 10.027756377 Simplifying x = 10.027756377

Subproblem 2

x + 8 = -18.027756377 Simplifying x + 8 = -18.027756377 Reorder the terms: 8 + x = -18.027756377 Solving 8 + x = -18.027756377 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 = -18.027756377 + -8 Combine like terms: 8 + -8 = 0 0 + x = -18.027756377 + -8 x = -18.027756377 + -8 Combine like terms: -18.027756377 + -8 = -26.027756377 x = -26.027756377 Simplifying x = -26.027756377

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.027756377, -26.027756377}

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