x^2-19x-102=0

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Solution for x^2-19x-102=0 equation:


Simplifying
x2 + -19x + -102 = 0

Reorder the terms:
-102 + -19x + x2 = 0

Solving
-102 + -19x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '102' to each side of the equation.
-102 + -19x + 102 + x2 = 0 + 102

Reorder the terms:
-102 + 102 + -19x + x2 = 0 + 102

Combine like terms: -102 + 102 = 0
0 + -19x + x2 = 0 + 102
-19x + x2 = 0 + 102

Combine like terms: 0 + 102 = 102
-19x + x2 = 102

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 = 102 + 90.25

Reorder the terms:
90.25 + -19x + x2 = 102 + 90.25

Combine like terms: 102 + 90.25 = 192.25
90.25 + -19x + x2 = 192.25

Factor a perfect square on the left side:
(x + -9.5)(x + -9.5) = 192.25

Calculate the square root of the right side: 13.865424624

Break this problem into two subproblems by setting 
(x + -9.5) equal to 13.865424624 and -13.865424624.

Subproblem 1

x + -9.5 = 13.865424624 Simplifying x + -9.5 = 13.865424624 Reorder the terms: -9.5 + x = 13.865424624 Solving -9.5 + x = 13.865424624 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 = 13.865424624 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = 13.865424624 + 9.5 x = 13.865424624 + 9.5 Combine like terms: 13.865424624 + 9.5 = 23.365424624 x = 23.365424624 Simplifying x = 23.365424624

Subproblem 2

x + -9.5 = -13.865424624 Simplifying x + -9.5 = -13.865424624 Reorder the terms: -9.5 + x = -13.865424624 Solving -9.5 + x = -13.865424624 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 = -13.865424624 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = -13.865424624 + 9.5 x = -13.865424624 + 9.5 Combine like terms: -13.865424624 + 9.5 = -4.365424624 x = -4.365424624 Simplifying x = -4.365424624

Solution

The solution to the problem is based on the solutions from the subproblems. x = {23.365424624, -4.365424624}

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