13x=19-x^2

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Solution for 13x=19-x^2 equation:


Simplifying
13x = 19 + -1x2

Solving
13x = 19 + -1x2

Solving for variable 'x'.

Reorder the terms:
-19 + 13x + x2 = 19 + -1x2 + -19 + x2

Reorder the terms:
-19 + 13x + x2 = 19 + -19 + -1x2 + x2

Combine like terms: 19 + -19 = 0
-19 + 13x + x2 = 0 + -1x2 + x2
-19 + 13x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-19 + 13x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + 13x + 19 + x2 = 0 + 19

Reorder the terms:
-19 + 19 + 13x + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + 13x + x2 = 0 + 19
13x + x2 = 0 + 19

Combine like terms: 0 + 19 = 19
13x + x2 = 19

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 = 19 + 42.25

Reorder the terms:
42.25 + 13x + x2 = 19 + 42.25

Combine like terms: 19 + 42.25 = 61.25
42.25 + 13x + x2 = 61.25

Factor a perfect square on the left side:
(x + 6.5)(x + 6.5) = 61.25

Calculate the square root of the right side: 7.826237921

Break this problem into two subproblems by setting 
(x + 6.5) equal to 7.826237921 and -7.826237921.

Subproblem 1

x + 6.5 = 7.826237921 Simplifying x + 6.5 = 7.826237921 Reorder the terms: 6.5 + x = 7.826237921 Solving 6.5 + x = 7.826237921 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 = 7.826237921 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = 7.826237921 + -6.5 x = 7.826237921 + -6.5 Combine like terms: 7.826237921 + -6.5 = 1.326237921 x = 1.326237921 Simplifying x = 1.326237921

Subproblem 2

x + 6.5 = -7.826237921 Simplifying x + 6.5 = -7.826237921 Reorder the terms: 6.5 + x = -7.826237921 Solving 6.5 + x = -7.826237921 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 = -7.826237921 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = -7.826237921 + -6.5 x = -7.826237921 + -6.5 Combine like terms: -7.826237921 + -6.5 = -14.326237921 x = -14.326237921 Simplifying x = -14.326237921

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.326237921, -14.326237921}

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