x^2+2x-672=0

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Solution for x^2+2x-672=0 equation:


Simplifying
x2 + 2x + -672 = 0

Reorder the terms:
-672 + 2x + x2 = 0

Solving
-672 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '672' to each side of the equation.
-672 + 2x + 672 + x2 = 0 + 672

Reorder the terms:
-672 + 672 + 2x + x2 = 0 + 672

Combine like terms: -672 + 672 = 0
0 + 2x + x2 = 0 + 672
2x + x2 = 0 + 672

Combine like terms: 0 + 672 = 672
2x + x2 = 672

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 = 672 + 1

Reorder the terms:
1 + 2x + x2 = 672 + 1

Combine like terms: 672 + 1 = 673
1 + 2x + x2 = 673

Factor a perfect square on the left side:
(x + 1)(x + 1) = 673

Calculate the square root of the right side: 25.942243542

Break this problem into two subproblems by setting 
(x + 1) equal to 25.942243542 and -25.942243542.

Subproblem 1

x + 1 = 25.942243542 Simplifying x + 1 = 25.942243542 Reorder the terms: 1 + x = 25.942243542 Solving 1 + x = 25.942243542 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 = 25.942243542 + -1 Combine like terms: 1 + -1 = 0 0 + x = 25.942243542 + -1 x = 25.942243542 + -1 Combine like terms: 25.942243542 + -1 = 24.942243542 x = 24.942243542 Simplifying x = 24.942243542

Subproblem 2

x + 1 = -25.942243542 Simplifying x + 1 = -25.942243542 Reorder the terms: 1 + x = -25.942243542 Solving 1 + x = -25.942243542 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 = -25.942243542 + -1 Combine like terms: 1 + -1 = 0 0 + x = -25.942243542 + -1 x = -25.942243542 + -1 Combine like terms: -25.942243542 + -1 = -26.942243542 x = -26.942243542 Simplifying x = -26.942243542

Solution

The solution to the problem is based on the solutions from the subproblems. x = {24.942243542, -26.942243542}

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