2x^2=-27x-18

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Solution for 2x^2=-27x-18 equation:


Simplifying
2x2 = -27x + -18

Reorder the terms:
2x2 = -18 + -27x

Solving
2x2 = -18 + -27x

Solving for variable 'x'.

Reorder the terms:
18 + 27x + 2x2 = -18 + -27x + 18 + 27x

Reorder the terms:
18 + 27x + 2x2 = -18 + 18 + -27x + 27x

Combine like terms: -18 + 18 = 0
18 + 27x + 2x2 = 0 + -27x + 27x
18 + 27x + 2x2 = -27x + 27x

Combine like terms: -27x + 27x = 0
18 + 27x + 2x2 = 0

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

Divide each side by '2'.
9 + 13.5x + x2 = 0

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + 13.5x + -9 + x2 = 0 + -9

Reorder the terms:
9 + -9 + 13.5x + x2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + 13.5x + x2 = 0 + -9
13.5x + x2 = 0 + -9

Combine like terms: 0 + -9 = -9
13.5x + x2 = -9

The x term is 13.5x.  Take half its coefficient (6.75).
Square it (45.5625) and add it to both sides.

Add '45.5625' to each side of the equation.
13.5x + 45.5625 + x2 = -9 + 45.5625

Reorder the terms:
45.5625 + 13.5x + x2 = -9 + 45.5625

Combine like terms: -9 + 45.5625 = 36.5625
45.5625 + 13.5x + x2 = 36.5625

Factor a perfect square on the left side:
(x + 6.75)(x + 6.75) = 36.5625

Calculate the square root of the right side: 6.046693311

Break this problem into two subproblems by setting 
(x + 6.75) equal to 6.046693311 and -6.046693311.

Subproblem 1

x + 6.75 = 6.046693311 Simplifying x + 6.75 = 6.046693311 Reorder the terms: 6.75 + x = 6.046693311 Solving 6.75 + x = 6.046693311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.75' to each side of the equation. 6.75 + -6.75 + x = 6.046693311 + -6.75 Combine like terms: 6.75 + -6.75 = 0.00 0.00 + x = 6.046693311 + -6.75 x = 6.046693311 + -6.75 Combine like terms: 6.046693311 + -6.75 = -0.703306689 x = -0.703306689 Simplifying x = -0.703306689

Subproblem 2

x + 6.75 = -6.046693311 Simplifying x + 6.75 = -6.046693311 Reorder the terms: 6.75 + x = -6.046693311 Solving 6.75 + x = -6.046693311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.75' to each side of the equation. 6.75 + -6.75 + x = -6.046693311 + -6.75 Combine like terms: 6.75 + -6.75 = 0.00 0.00 + x = -6.046693311 + -6.75 x = -6.046693311 + -6.75 Combine like terms: -6.046693311 + -6.75 = -12.796693311 x = -12.796693311 Simplifying x = -12.796693311

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.703306689, -12.796693311}

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