x^2+16=13x

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


Simplifying
x2 + 16 = 13x

Reorder the terms:
16 + x2 = 13x

Solving
16 + x2 = 13x

Solving for variable 'x'.

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

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

Begin completing the square.

Move the constant term to the right:

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

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

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

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

The x term is -13x.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13x + 42.25 + x2 = -16 + 42.25

Reorder the terms:
42.25 + -13x + x2 = -16 + 42.25

Combine like terms: -16 + 42.25 = 26.25
42.25 + -13x + x2 = 26.25

Factor a perfect square on the left side:
(x + -6.5)(x + -6.5) = 26.25

Calculate the square root of the right side: 5.123475383

Break this problem into two subproblems by setting 
(x + -6.5) equal to 5.123475383 and -5.123475383.

Subproblem 1

x + -6.5 = 5.123475383 Simplifying x + -6.5 = 5.123475383 Reorder the terms: -6.5 + x = 5.123475383 Solving -6.5 + x = 5.123475383 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = 5.123475383 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = 5.123475383 + 6.5 x = 5.123475383 + 6.5 Combine like terms: 5.123475383 + 6.5 = 11.623475383 x = 11.623475383 Simplifying x = 11.623475383

Subproblem 2

x + -6.5 = -5.123475383 Simplifying x + -6.5 = -5.123475383 Reorder the terms: -6.5 + x = -5.123475383 Solving -6.5 + x = -5.123475383 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = -5.123475383 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = -5.123475383 + 6.5 x = -5.123475383 + 6.5 Combine like terms: -5.123475383 + 6.5 = 1.376524617 x = 1.376524617 Simplifying x = 1.376524617

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.623475383, 1.376524617}

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