4x^2+18x=1

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Solution for 4x^2+18x=1 equation:


Simplifying
4x2 + 18x = 1

Reorder the terms:
18x + 4x2 = 1

Solving
18x + 4x2 = 1

Solving for variable 'x'.

Reorder the terms:
-1 + 18x + 4x2 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + 18x + 4x2 = 0

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

Divide each side by '4'.
-0.25 + 4.5x + x2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + 4.5x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + 4.5x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + 4.5x + x2 = 0 + 0.25
4.5x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
4.5x + x2 = 0.25

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 = 0.25 + 5.0625

Reorder the terms:
5.0625 + 4.5x + x2 = 0.25 + 5.0625

Combine like terms: 0.25 + 5.0625 = 5.3125
5.0625 + 4.5x + x2 = 5.3125

Factor a perfect square on the left side:
(x + 2.25)(x + 2.25) = 5.3125

Calculate the square root of the right side: 2.304886114

Break this problem into two subproblems by setting 
(x + 2.25) equal to 2.304886114 and -2.304886114.

Subproblem 1

x + 2.25 = 2.304886114 Simplifying x + 2.25 = 2.304886114 Reorder the terms: 2.25 + x = 2.304886114 Solving 2.25 + x = 2.304886114 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 = 2.304886114 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = 2.304886114 + -2.25 x = 2.304886114 + -2.25 Combine like terms: 2.304886114 + -2.25 = 0.054886114 x = 0.054886114 Simplifying x = 0.054886114

Subproblem 2

x + 2.25 = -2.304886114 Simplifying x + 2.25 = -2.304886114 Reorder the terms: 2.25 + x = -2.304886114 Solving 2.25 + x = -2.304886114 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 = -2.304886114 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = -2.304886114 + -2.25 x = -2.304886114 + -2.25 Combine like terms: -2.304886114 + -2.25 = -4.554886114 x = -4.554886114 Simplifying x = -4.554886114

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.054886114, -4.554886114}

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