18x^2+18x=35

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Solution for 18x^2+18x=35 equation:


Simplifying
18x2 + 18x = 35

Reorder the terms:
18x + 18x2 = 35

Solving
18x + 18x2 = 35

Solving for variable 'x'.

Reorder the terms:
-35 + 18x + 18x2 = 35 + -35

Combine like terms: 35 + -35 = 0
-35 + 18x + 18x2 = 0

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

Divide each side by '18'.
-1.944444444 + x + x2 = 0

Move the constant term to the right:

Add '1.944444444' to each side of the equation.
-1.944444444 + x + 1.944444444 + x2 = 0 + 1.944444444

Reorder the terms:
-1.944444444 + 1.944444444 + x + x2 = 0 + 1.944444444

Combine like terms: -1.944444444 + 1.944444444 = 0.000000000
0.000000000 + x + x2 = 0 + 1.944444444
x + x2 = 0 + 1.944444444

Combine like terms: 0 + 1.944444444 = 1.944444444
x + x2 = 1.944444444

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

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 1.944444444 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 1.944444444 + 0.25

Combine like terms: 1.944444444 + 0.25 = 2.194444444
1.25 + x2 = 2.194444444

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 2.194444444

Calculate the square root of the right side: 1.481365736

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.481365736 and -1.481365736.

Subproblem 1

x + 0.5 = 1.481365736 Simplifying x + 0.5 = 1.481365736 Reorder the terms: 0.5 + x = 1.481365736 Solving 0.5 + x = 1.481365736 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 1.481365736 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.481365736 + -0.5 x = 1.481365736 + -0.5 Combine like terms: 1.481365736 + -0.5 = 0.981365736 x = 0.981365736 Simplifying x = 0.981365736

Subproblem 2

x + 0.5 = -1.481365736 Simplifying x + 0.5 = -1.481365736 Reorder the terms: 0.5 + x = -1.481365736 Solving 0.5 + x = -1.481365736 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -1.481365736 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.481365736 + -0.5 x = -1.481365736 + -0.5 Combine like terms: -1.481365736 + -0.5 = -1.981365736 x = -1.981365736 Simplifying x = -1.981365736

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.981365736, -1.981365736}

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