8*x^2+4x=3

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Solution for 8*x^2+4x=3 equation:


Simplifying
8x2 + 4x = 3

Reorder the terms:
4x + 8x2 = 3

Solving
4x + 8x2 = 3

Solving for variable 'x'.

Reorder the terms:
-3 + 4x + 8x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-3 + 4x + 8x2 = 0

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

Divide each side by '8'.
-0.375 + 0.5x + x2 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + 0.5x + 0.375 + x2 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + 0.5x + x2 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + 0.5x + x2 = 0 + 0.375
0.5x + x2 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
0.5x + x2 = 0.375

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 = 0.375 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 0.375 + 0.0625

Combine like terms: 0.375 + 0.0625 = 0.4375
0.0625 + 0.5x + x2 = 0.4375

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 0.4375

Calculate the square root of the right side: 0.661437828

Break this problem into two subproblems by setting 
(x + 0.25) equal to 0.661437828 and -0.661437828.

Subproblem 1

x + 0.25 = 0.661437828 Simplifying x + 0.25 = 0.661437828 Reorder the terms: 0.25 + x = 0.661437828 Solving 0.25 + x = 0.661437828 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 = 0.661437828 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 0.661437828 + -0.25 x = 0.661437828 + -0.25 Combine like terms: 0.661437828 + -0.25 = 0.411437828 x = 0.411437828 Simplifying x = 0.411437828

Subproblem 2

x + 0.25 = -0.661437828 Simplifying x + 0.25 = -0.661437828 Reorder the terms: 0.25 + x = -0.661437828 Solving 0.25 + x = -0.661437828 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 = -0.661437828 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -0.661437828 + -0.25 x = -0.661437828 + -0.25 Combine like terms: -0.661437828 + -0.25 = -0.911437828 x = -0.911437828 Simplifying x = -0.911437828

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.411437828, -0.911437828}

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