8x^2+4x=543

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Solution for 8x^2+4x=543 equation:


Simplifying
8x2 + 4x = 543

Reorder the terms:
4x + 8x2 = 543

Solving
4x + 8x2 = 543

Solving for variable 'x'.

Reorder the terms:
-543 + 4x + 8x2 = 543 + -543

Combine like terms: 543 + -543 = 0
-543 + 4x + 8x2 = 0

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

Divide each side by '8'.
-67.875 + 0.5x + x2 = 0

Move the constant term to the right:

Add '67.875' to each side of the equation.
-67.875 + 0.5x + 67.875 + x2 = 0 + 67.875

Reorder the terms:
-67.875 + 67.875 + 0.5x + x2 = 0 + 67.875

Combine like terms: -67.875 + 67.875 = 0.000
0.000 + 0.5x + x2 = 0 + 67.875
0.5x + x2 = 0 + 67.875

Combine like terms: 0 + 67.875 = 67.875
0.5x + x2 = 67.875

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 67.875 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 67.875 + 0.0625

Combine like terms: 67.875 + 0.0625 = 67.9375
0.0625 + 0.5x + x2 = 67.9375

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 67.9375

Calculate the square root of the right side: 8.242420761

Break this problem into two subproblems by setting 
(x + 0.25) equal to 8.242420761 and -8.242420761.

Subproblem 1

x + 0.25 = 8.242420761 Simplifying x + 0.25 = 8.242420761 Reorder the terms: 0.25 + x = 8.242420761 Solving 0.25 + x = 8.242420761 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 8.242420761 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 8.242420761 + -0.25 x = 8.242420761 + -0.25 Combine like terms: 8.242420761 + -0.25 = 7.992420761 x = 7.992420761 Simplifying x = 7.992420761

Subproblem 2

x + 0.25 = -8.242420761 Simplifying x + 0.25 = -8.242420761 Reorder the terms: 0.25 + x = -8.242420761 Solving 0.25 + x = -8.242420761 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -8.242420761 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -8.242420761 + -0.25 x = -8.242420761 + -0.25 Combine like terms: -8.242420761 + -0.25 = -8.492420761 x = -8.492420761 Simplifying x = -8.492420761

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.992420761, -8.492420761}

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