2x^2+18x+3=0

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


Simplifying
2x2 + 18x + 3 = 0

Reorder the terms:
3 + 18x + 2x2 = 0

Solving
3 + 18x + 2x2 = 0

Solving for variable 'x'.

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 = 18.75
20.25 + 9x + x2 = 18.75

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 18.75

Calculate the square root of the right side: 4.330127019

Break this problem into two subproblems by setting 
(x + 4.5) equal to 4.330127019 and -4.330127019.

Subproblem 1

x + 4.5 = 4.330127019 Simplifying x + 4.5 = 4.330127019 Reorder the terms: 4.5 + x = 4.330127019 Solving 4.5 + x = 4.330127019 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 = 4.330127019 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 4.330127019 + -4.5 x = 4.330127019 + -4.5 Combine like terms: 4.330127019 + -4.5 = -0.169872981 x = -0.169872981 Simplifying x = -0.169872981

Subproblem 2

x + 4.5 = -4.330127019 Simplifying x + 4.5 = -4.330127019 Reorder the terms: 4.5 + x = -4.330127019 Solving 4.5 + x = -4.330127019 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 = -4.330127019 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -4.330127019 + -4.5 x = -4.330127019 + -4.5 Combine like terms: -4.330127019 + -4.5 = -8.830127019 x = -8.830127019 Simplifying x = -8.830127019

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.169872981, -8.830127019}

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