5x^2+8x-670=0

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Solution for 5x^2+8x-670=0 equation:


Simplifying
5x2 + 8x + -670 = 0

Reorder the terms:
-670 + 8x + 5x2 = 0

Solving
-670 + 8x + 5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-134 + 1.6x + x2 = 0

Move the constant term to the right:

Add '134' to each side of the equation.
-134 + 1.6x + 134 + x2 = 0 + 134

Reorder the terms:
-134 + 134 + 1.6x + x2 = 0 + 134

Combine like terms: -134 + 134 = 0
0 + 1.6x + x2 = 0 + 134
1.6x + x2 = 0 + 134

Combine like terms: 0 + 134 = 134
1.6x + x2 = 134

The x term is 1.6x.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6x + 0.64 + x2 = 134 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = 134 + 0.64

Combine like terms: 134 + 0.64 = 134.64
0.64 + 1.6x + x2 = 134.64

Factor a perfect square on the left side:
(x + 0.8)(x + 0.8) = 134.64

Calculate the square root of the right side: 11.603447763

Break this problem into two subproblems by setting 
(x + 0.8) equal to 11.603447763 and -11.603447763.

Subproblem 1

x + 0.8 = 11.603447763 Simplifying x + 0.8 = 11.603447763 Reorder the terms: 0.8 + x = 11.603447763 Solving 0.8 + x = 11.603447763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = 11.603447763 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = 11.603447763 + -0.8 x = 11.603447763 + -0.8 Combine like terms: 11.603447763 + -0.8 = 10.803447763 x = 10.803447763 Simplifying x = 10.803447763

Subproblem 2

x + 0.8 = -11.603447763 Simplifying x + 0.8 = -11.603447763 Reorder the terms: 0.8 + x = -11.603447763 Solving 0.8 + x = -11.603447763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = -11.603447763 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = -11.603447763 + -0.8 x = -11.603447763 + -0.8 Combine like terms: -11.603447763 + -0.8 = -12.403447763 x = -12.403447763 Simplifying x = -12.403447763

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.803447763, -12.403447763}

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