x^2+3x-670=0

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Solution for x^2+3x-670=0 equation:


Simplifying
x2 + 3x + -670 = 0

Reorder the terms:
-670 + 3x + x2 = 0

Solving
-670 + 3x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '670' to each side of the equation.
-670 + 3x + 670 + x2 = 0 + 670

Reorder the terms:
-670 + 670 + 3x + x2 = 0 + 670

Combine like terms: -670 + 670 = 0
0 + 3x + x2 = 0 + 670
3x + x2 = 0 + 670

Combine like terms: 0 + 670 = 670
3x + x2 = 670

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 670 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 670 + 2.25

Combine like terms: 670 + 2.25 = 672.25
2.25 + 3x + x2 = 672.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 672.25

Calculate the square root of the right side: 25.927784325

Break this problem into two subproblems by setting 
(x + 1.5) equal to 25.927784325 and -25.927784325.

Subproblem 1

x + 1.5 = 25.927784325 Simplifying x + 1.5 = 25.927784325 Reorder the terms: 1.5 + x = 25.927784325 Solving 1.5 + x = 25.927784325 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 25.927784325 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 25.927784325 + -1.5 x = 25.927784325 + -1.5 Combine like terms: 25.927784325 + -1.5 = 24.427784325 x = 24.427784325 Simplifying x = 24.427784325

Subproblem 2

x + 1.5 = -25.927784325 Simplifying x + 1.5 = -25.927784325 Reorder the terms: 1.5 + x = -25.927784325 Solving 1.5 + x = -25.927784325 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -25.927784325 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -25.927784325 + -1.5 x = -25.927784325 + -1.5 Combine like terms: -25.927784325 + -1.5 = -27.427784325 x = -27.427784325 Simplifying x = -27.427784325

Solution

The solution to the problem is based on the solutions from the subproblems. x = {24.427784325, -27.427784325}

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