x^2+16x=13

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Solution for x^2+16x=13 equation:


Simplifying
x2 + 16x = 13

Reorder the terms:
16x + x2 = 13

Solving
16x + x2 = 13

Solving for variable 'x'.

Reorder the terms:
-13 + 16x + x2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 16x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + 16x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 16x + x2 = 0 + 13
16x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
16x + x2 = 13

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 = 13 + 64

Reorder the terms:
64 + 16x + x2 = 13 + 64

Combine like terms: 13 + 64 = 77
64 + 16x + x2 = 77

Factor a perfect square on the left side:
(x + 8)(x + 8) = 77

Calculate the square root of the right side: 8.774964387

Break this problem into two subproblems by setting 
(x + 8) equal to 8.774964387 and -8.774964387.

Subproblem 1

x + 8 = 8.774964387 Simplifying x + 8 = 8.774964387 Reorder the terms: 8 + x = 8.774964387 Solving 8 + x = 8.774964387 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 = 8.774964387 + -8 Combine like terms: 8 + -8 = 0 0 + x = 8.774964387 + -8 x = 8.774964387 + -8 Combine like terms: 8.774964387 + -8 = 0.774964387 x = 0.774964387 Simplifying x = 0.774964387

Subproblem 2

x + 8 = -8.774964387 Simplifying x + 8 = -8.774964387 Reorder the terms: 8 + x = -8.774964387 Solving 8 + x = -8.774964387 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 = -8.774964387 + -8 Combine like terms: 8 + -8 = 0 0 + x = -8.774964387 + -8 x = -8.774964387 + -8 Combine like terms: -8.774964387 + -8 = -16.774964387 x = -16.774964387 Simplifying x = -16.774964387

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.774964387, -16.774964387}

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