4x^2+x-676=0

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Solution for 4x^2+x-676=0 equation:


Simplifying
4x2 + x + -676 = 0

Reorder the terms:
-676 + x + 4x2 = 0

Solving
-676 + x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-169 + 0.25x + x2 = 0

Move the constant term to the right:

Add '169' to each side of the equation.
-169 + 0.25x + 169 + x2 = 0 + 169

Reorder the terms:
-169 + 169 + 0.25x + x2 = 0 + 169

Combine like terms: -169 + 169 = 0
0 + 0.25x + x2 = 0 + 169
0.25x + x2 = 0 + 169

Combine like terms: 0 + 169 = 169
0.25x + x2 = 169

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.25x + 0.25 + x2 = 169 + 0.25

Reorder the terms:
0.25 + 0.25x + x2 = 169 + 0.25

Combine like terms: 169 + 0.25 = 169.25
0.25 + 0.25x + x2 = 169.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 169.25

Calculate the square root of the right side: 13.009611831

Break this problem into two subproblems by setting 
(x + 0.5) equal to 13.009611831 and -13.009611831.

Subproblem 1

x + 0.5 = 13.009611831 Simplifying x + 0.5 = 13.009611831 Reorder the terms: 0.5 + x = 13.009611831 Solving 0.5 + x = 13.009611831 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 13.009611831 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 13.009611831 + -0.5 x = 13.009611831 + -0.5 Combine like terms: 13.009611831 + -0.5 = 12.509611831 x = 12.509611831 Simplifying x = 12.509611831

Subproblem 2

x + 0.5 = -13.009611831 Simplifying x + 0.5 = -13.009611831 Reorder the terms: 0.5 + x = -13.009611831 Solving 0.5 + x = -13.009611831 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -13.009611831 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -13.009611831 + -0.5 x = -13.009611831 + -0.5 Combine like terms: -13.009611831 + -0.5 = -13.509611831 x = -13.509611831 Simplifying x = -13.509611831

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.509611831, -13.509611831}

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