x^2-19x-77=0

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Solution for x^2-19x-77=0 equation:


Simplifying
x2 + -19x + -77 = 0

Reorder the terms:
-77 + -19x + x2 = 0

Solving
-77 + -19x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '77' to each side of the equation.
-77 + -19x + 77 + x2 = 0 + 77

Reorder the terms:
-77 + 77 + -19x + x2 = 0 + 77

Combine like terms: -77 + 77 = 0
0 + -19x + x2 = 0 + 77
-19x + x2 = 0 + 77

Combine like terms: 0 + 77 = 77
-19x + x2 = 77

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 = 77 + 90.25

Reorder the terms:
90.25 + -19x + x2 = 77 + 90.25

Combine like terms: 77 + 90.25 = 167.25
90.25 + -19x + x2 = 167.25

Factor a perfect square on the left side:
(x + -9.5)(x + -9.5) = 167.25

Calculate the square root of the right side: 12.932517156

Break this problem into two subproblems by setting 
(x + -9.5) equal to 12.932517156 and -12.932517156.

Subproblem 1

x + -9.5 = 12.932517156 Simplifying x + -9.5 = 12.932517156 Reorder the terms: -9.5 + x = 12.932517156 Solving -9.5 + x = 12.932517156 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 = 12.932517156 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = 12.932517156 + 9.5 x = 12.932517156 + 9.5 Combine like terms: 12.932517156 + 9.5 = 22.432517156 x = 22.432517156 Simplifying x = 22.432517156

Subproblem 2

x + -9.5 = -12.932517156 Simplifying x + -9.5 = -12.932517156 Reorder the terms: -9.5 + x = -12.932517156 Solving -9.5 + x = -12.932517156 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 = -12.932517156 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = -12.932517156 + 9.5 x = -12.932517156 + 9.5 Combine like terms: -12.932517156 + 9.5 = -3.432517156 x = -3.432517156 Simplifying x = -3.432517156

Solution

The solution to the problem is based on the solutions from the subproblems. x = {22.432517156, -3.432517156}

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