x^2+19x-11=0

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Solution for x^2+19x-11=0 equation:


Simplifying
x2 + 19x + -11 = 0

Reorder the terms:
-11 + 19x + x2 = 0

Solving
-11 + 19x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 19x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + 19x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 19x + x2 = 0 + 11
19x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
19x + x2 = 11

The x term is 19x.  Take half its coefficient (9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
19x + 90.25 + x2 = 11 + 90.25

Reorder the terms:
90.25 + 19x + x2 = 11 + 90.25

Combine like terms: 11 + 90.25 = 101.25
90.25 + 19x + x2 = 101.25

Factor a perfect square on the left side:
(x + 9.5)(x + 9.5) = 101.25

Calculate the square root of the right side: 10.062305899

Break this problem into two subproblems by setting 
(x + 9.5) equal to 10.062305899 and -10.062305899.

Subproblem 1

x + 9.5 = 10.062305899 Simplifying x + 9.5 = 10.062305899 Reorder the terms: 9.5 + x = 10.062305899 Solving 9.5 + x = 10.062305899 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9.5' to each side of the equation. 9.5 + -9.5 + x = 10.062305899 + -9.5 Combine like terms: 9.5 + -9.5 = 0.0 0.0 + x = 10.062305899 + -9.5 x = 10.062305899 + -9.5 Combine like terms: 10.062305899 + -9.5 = 0.562305899 x = 0.562305899 Simplifying x = 0.562305899

Subproblem 2

x + 9.5 = -10.062305899 Simplifying x + 9.5 = -10.062305899 Reorder the terms: 9.5 + x = -10.062305899 Solving 9.5 + x = -10.062305899 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9.5' to each side of the equation. 9.5 + -9.5 + x = -10.062305899 + -9.5 Combine like terms: 9.5 + -9.5 = 0.0 0.0 + x = -10.062305899 + -9.5 x = -10.062305899 + -9.5 Combine like terms: -10.062305899 + -9.5 = -19.562305899 x = -19.562305899 Simplifying x = -19.562305899

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.562305899, -19.562305899}

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