8x^2+18x+3=0

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Solution for 8x^2+18x+3=0 equation:


Simplifying
8x2 + 18x + 3 = 0

Reorder the terms:
3 + 18x + 8x2 = 0

Solving
3 + 18x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
0.375 + 2.25x + x2 = 0

Move the constant term to the right:

Add '-0.375' to each side of the equation.
0.375 + 2.25x + -0.375 + x2 = 0 + -0.375

Reorder the terms:
0.375 + -0.375 + 2.25x + x2 = 0 + -0.375

Combine like terms: 0.375 + -0.375 = 0.000
0.000 + 2.25x + x2 = 0 + -0.375
2.25x + x2 = 0 + -0.375

Combine like terms: 0 + -0.375 = -0.375
2.25x + x2 = -0.375

The x term is 2.25x.  Take half its coefficient (1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
2.25x + 1.265625 + x2 = -0.375 + 1.265625

Reorder the terms:
1.265625 + 2.25x + x2 = -0.375 + 1.265625

Combine like terms: -0.375 + 1.265625 = 0.890625
1.265625 + 2.25x + x2 = 0.890625

Factor a perfect square on the left side:
(x + 1.125)(x + 1.125) = 0.890625

Calculate the square root of the right side: 0.943729304

Break this problem into two subproblems by setting 
(x + 1.125) equal to 0.943729304 and -0.943729304.

Subproblem 1

x + 1.125 = 0.943729304 Simplifying x + 1.125 = 0.943729304 Reorder the terms: 1.125 + x = 0.943729304 Solving 1.125 + x = 0.943729304 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + x = 0.943729304 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = 0.943729304 + -1.125 x = 0.943729304 + -1.125 Combine like terms: 0.943729304 + -1.125 = -0.181270696 x = -0.181270696 Simplifying x = -0.181270696

Subproblem 2

x + 1.125 = -0.943729304 Simplifying x + 1.125 = -0.943729304 Reorder the terms: 1.125 + x = -0.943729304 Solving 1.125 + x = -0.943729304 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + x = -0.943729304 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = -0.943729304 + -1.125 x = -0.943729304 + -1.125 Combine like terms: -0.943729304 + -1.125 = -2.068729304 x = -2.068729304 Simplifying x = -2.068729304

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.181270696, -2.068729304}

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