2x^2+18x=3

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


Simplifying
2x2 + 18x = 3

Reorder the terms:
18x + 2x2 = 3

Solving
18x + 2x2 = 3

Solving for variable 'x'.

Reorder the terms:
-3 + 18x + 2x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-3 + 18x + 2x2 = 0

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

Divide each side by '2'.
-1.5 + 9x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + 9x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + 9x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + 9x + x2 = 0 + 1.5
9x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
9x + x2 = 1.5

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 1.5 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 1.5 + 20.25

Combine like terms: 1.5 + 20.25 = 21.75
20.25 + 9x + x2 = 21.75

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 21.75

Calculate the square root of the right side: 4.663689527

Break this problem into two subproblems by setting 
(x + 4.5) equal to 4.663689527 and -4.663689527.

Subproblem 1

x + 4.5 = 4.663689527 Simplifying x + 4.5 = 4.663689527 Reorder the terms: 4.5 + x = 4.663689527 Solving 4.5 + x = 4.663689527 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 4.663689527 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 4.663689527 + -4.5 x = 4.663689527 + -4.5 Combine like terms: 4.663689527 + -4.5 = 0.163689527 x = 0.163689527 Simplifying x = 0.163689527

Subproblem 2

x + 4.5 = -4.663689527 Simplifying x + 4.5 = -4.663689527 Reorder the terms: 4.5 + x = -4.663689527 Solving 4.5 + x = -4.663689527 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -4.663689527 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -4.663689527 + -4.5 x = -4.663689527 + -4.5 Combine like terms: -4.663689527 + -4.5 = -9.163689527 x = -9.163689527 Simplifying x = -9.163689527

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.163689527, -9.163689527}

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