2x^2-27x-8.3=0

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Solution for 2x^2-27x-8.3=0 equation:


Simplifying
2x2 + -27x + -8.3 = 0

Reorder the terms:
-8.3 + -27x + 2x2 = 0

Solving
-8.3 + -27x + 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'.
-4.15 + -13.5x + x2 = 0

Move the constant term to the right:

Add '4.15' to each side of the equation.
-4.15 + -13.5x + 4.15 + x2 = 0 + 4.15

Reorder the terms:
-4.15 + 4.15 + -13.5x + x2 = 0 + 4.15

Combine like terms: -4.15 + 4.15 = 0.00
0.00 + -13.5x + x2 = 0 + 4.15
-13.5x + x2 = 0 + 4.15

Combine like terms: 0 + 4.15 = 4.15
-13.5x + x2 = 4.15

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 = 4.15 + 45.5625

Reorder the terms:
45.5625 + -13.5x + x2 = 4.15 + 45.5625

Combine like terms: 4.15 + 45.5625 = 49.7125
45.5625 + -13.5x + x2 = 49.7125

Factor a perfect square on the left side:
(x + -6.75)(x + -6.75) = 49.7125

Calculate the square root of the right side: 7.050709184

Break this problem into two subproblems by setting 
(x + -6.75) equal to 7.050709184 and -7.050709184.

Subproblem 1

x + -6.75 = 7.050709184 Simplifying x + -6.75 = 7.050709184 Reorder the terms: -6.75 + x = 7.050709184 Solving -6.75 + x = 7.050709184 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 = 7.050709184 + 6.75 Combine like terms: -6.75 + 6.75 = 0.00 0.00 + x = 7.050709184 + 6.75 x = 7.050709184 + 6.75 Combine like terms: 7.050709184 + 6.75 = 13.800709184 x = 13.800709184 Simplifying x = 13.800709184

Subproblem 2

x + -6.75 = -7.050709184 Simplifying x + -6.75 = -7.050709184 Reorder the terms: -6.75 + x = -7.050709184 Solving -6.75 + x = -7.050709184 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 = -7.050709184 + 6.75 Combine like terms: -6.75 + 6.75 = 0.00 0.00 + x = -7.050709184 + 6.75 x = -7.050709184 + 6.75 Combine like terms: -7.050709184 + 6.75 = -0.300709184 x = -0.300709184 Simplifying x = -0.300709184

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.800709184, -0.300709184}

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