4x^2+18x+3=0

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Solution for 4x^2+18x+3=0 equation:


Simplifying
4x2 + 18x + 3 = 0

Reorder the terms:
3 + 18x + 4x2 = 0

Solving
3 + 18x + 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'.
0.75 + 4.5x + x2 = 0

Move the constant term to the right:

Add '-0.75' to each side of the equation.
0.75 + 4.5x + -0.75 + x2 = 0 + -0.75

Reorder the terms:
0.75 + -0.75 + 4.5x + x2 = 0 + -0.75

Combine like terms: 0.75 + -0.75 = 0.00
0.00 + 4.5x + x2 = 0 + -0.75
4.5x + x2 = 0 + -0.75

Combine like terms: 0 + -0.75 = -0.75
4.5x + x2 = -0.75

The x term is 4.5x.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5x + 5.0625 + x2 = -0.75 + 5.0625

Reorder the terms:
5.0625 + 4.5x + x2 = -0.75 + 5.0625

Combine like terms: -0.75 + 5.0625 = 4.3125
5.0625 + 4.5x + x2 = 4.3125

Factor a perfect square on the left side:
(x + 2.25)(x + 2.25) = 4.3125

Calculate the square root of the right side: 2.076655966

Break this problem into two subproblems by setting 
(x + 2.25) equal to 2.076655966 and -2.076655966.

Subproblem 1

x + 2.25 = 2.076655966 Simplifying x + 2.25 = 2.076655966 Reorder the terms: 2.25 + x = 2.076655966 Solving 2.25 + x = 2.076655966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = 2.076655966 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = 2.076655966 + -2.25 x = 2.076655966 + -2.25 Combine like terms: 2.076655966 + -2.25 = -0.173344034 x = -0.173344034 Simplifying x = -0.173344034

Subproblem 2

x + 2.25 = -2.076655966 Simplifying x + 2.25 = -2.076655966 Reorder the terms: 2.25 + x = -2.076655966 Solving 2.25 + x = -2.076655966 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = -2.076655966 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = -2.076655966 + -2.25 x = -2.076655966 + -2.25 Combine like terms: -2.076655966 + -2.25 = -4.326655966 x = -4.326655966 Simplifying x = -4.326655966

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.173344034, -4.326655966}

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