0=x^2-10x-19

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Solution for 0=x^2-10x-19 equation:


Simplifying
0 = x2 + -10x + -19

Reorder the terms:
0 = -19 + -10x + x2

Solving
0 = -19 + -10x + x2

Solving for variable 'x'.

Combine like terms: 0 + 19 = 19
19 + 10x + -1x2 = -19 + -10x + x2 + 19 + 10x + -1x2

Reorder the terms:
19 + 10x + -1x2 = -19 + 19 + -10x + 10x + x2 + -1x2

Combine like terms: -19 + 19 = 0
19 + 10x + -1x2 = 0 + -10x + 10x + x2 + -1x2
19 + 10x + -1x2 = -10x + 10x + x2 + -1x2

Combine like terms: -10x + 10x = 0
19 + 10x + -1x2 = 0 + x2 + -1x2
19 + 10x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
19 + 10x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-19 + -10x + x2 = 0

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + -10x + 19 + x2 = 0 + 19

Reorder the terms:
-19 + 19 + -10x + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + -10x + x2 = 0 + 19
-10x + x2 = 0 + 19

Combine like terms: 0 + 19 = 19
-10x + x2 = 19

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 19 + 25

Reorder the terms:
25 + -10x + x2 = 19 + 25

Combine like terms: 19 + 25 = 44
25 + -10x + x2 = 44

Factor a perfect square on the left side:
(x + -5)(x + -5) = 44

Calculate the square root of the right side: 6.633249581

Break this problem into two subproblems by setting 
(x + -5) equal to 6.633249581 and -6.633249581.

Subproblem 1

x + -5 = 6.633249581 Simplifying x + -5 = 6.633249581 Reorder the terms: -5 + x = 6.633249581 Solving -5 + x = 6.633249581 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 6.633249581 + 5 Combine like terms: -5 + 5 = 0 0 + x = 6.633249581 + 5 x = 6.633249581 + 5 Combine like terms: 6.633249581 + 5 = 11.633249581 x = 11.633249581 Simplifying x = 11.633249581

Subproblem 2

x + -5 = -6.633249581 Simplifying x + -5 = -6.633249581 Reorder the terms: -5 + x = -6.633249581 Solving -5 + x = -6.633249581 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -6.633249581 + 5 Combine like terms: -5 + 5 = 0 0 + x = -6.633249581 + 5 x = -6.633249581 + 5 Combine like terms: -6.633249581 + 5 = -1.633249581 x = -1.633249581 Simplifying x = -1.633249581

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.633249581, -1.633249581}

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