x^2=-4x+19

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Solution for x^2=-4x+19 equation:


Simplifying
x2 = -4x + 19

Reorder the terms:
x2 = 19 + -4x

Solving
x2 = 19 + -4x

Solving for variable 'x'.

Reorder the terms:
-19 + 4x + x2 = 19 + -4x + -19 + 4x

Reorder the terms:
-19 + 4x + x2 = 19 + -19 + -4x + 4x

Combine like terms: 19 + -19 = 0
-19 + 4x + x2 = 0 + -4x + 4x
-19 + 4x + x2 = -4x + 4x

Combine like terms: -4x + 4x = 0
-19 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + 4x + 19 + x2 = 0 + 19

Reorder the terms:
-19 + 19 + 4x + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + 4x + x2 = 0 + 19
4x + x2 = 0 + 19

Combine like terms: 0 + 19 = 19
4x + x2 = 19

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 19 + 4

Reorder the terms:
4 + 4x + x2 = 19 + 4

Combine like terms: 19 + 4 = 23
4 + 4x + x2 = 23

Factor a perfect square on the left side:
(x + 2)(x + 2) = 23

Calculate the square root of the right side: 4.795831523

Break this problem into two subproblems by setting 
(x + 2) equal to 4.795831523 and -4.795831523.

Subproblem 1

x + 2 = 4.795831523 Simplifying x + 2 = 4.795831523 Reorder the terms: 2 + x = 4.795831523 Solving 2 + x = 4.795831523 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 4.795831523 + -2 Combine like terms: 2 + -2 = 0 0 + x = 4.795831523 + -2 x = 4.795831523 + -2 Combine like terms: 4.795831523 + -2 = 2.795831523 x = 2.795831523 Simplifying x = 2.795831523

Subproblem 2

x + 2 = -4.795831523 Simplifying x + 2 = -4.795831523 Reorder the terms: 2 + x = -4.795831523 Solving 2 + x = -4.795831523 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -4.795831523 + -2 Combine like terms: 2 + -2 = 0 0 + x = -4.795831523 + -2 x = -4.795831523 + -2 Combine like terms: -4.795831523 + -2 = -6.795831523 x = -6.795831523 Simplifying x = -6.795831523

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.795831523, -6.795831523}

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