x^2+2x-677=0

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Solution for x^2+2x-677=0 equation:


Simplifying
x2 + 2x + -677 = 0

Reorder the terms:
-677 + 2x + x2 = 0

Solving
-677 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '677' to each side of the equation.
-677 + 2x + 677 + x2 = 0 + 677

Reorder the terms:
-677 + 677 + 2x + x2 = 0 + 677

Combine like terms: -677 + 677 = 0
0 + 2x + x2 = 0 + 677
2x + x2 = 0 + 677

Combine like terms: 0 + 677 = 677
2x + x2 = 677

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 677 + 1

Reorder the terms:
1 + 2x + x2 = 677 + 1

Combine like terms: 677 + 1 = 678
1 + 2x + x2 = 678

Factor a perfect square on the left side:
(x + 1)(x + 1) = 678

Calculate the square root of the right side: 26.038433133

Break this problem into two subproblems by setting 
(x + 1) equal to 26.038433133 and -26.038433133.

Subproblem 1

x + 1 = 26.038433133 Simplifying x + 1 = 26.038433133 Reorder the terms: 1 + x = 26.038433133 Solving 1 + x = 26.038433133 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 26.038433133 + -1 Combine like terms: 1 + -1 = 0 0 + x = 26.038433133 + -1 x = 26.038433133 + -1 Combine like terms: 26.038433133 + -1 = 25.038433133 x = 25.038433133 Simplifying x = 25.038433133

Subproblem 2

x + 1 = -26.038433133 Simplifying x + 1 = -26.038433133 Reorder the terms: 1 + x = -26.038433133 Solving 1 + x = -26.038433133 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -26.038433133 + -1 Combine like terms: 1 + -1 = 0 0 + x = -26.038433133 + -1 x = -26.038433133 + -1 Combine like terms: -26.038433133 + -1 = -27.038433133 x = -27.038433133 Simplifying x = -27.038433133

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.038433133, -27.038433133}

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