11x^2-33x-398=0

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Solution for 11x^2-33x-398=0 equation:


Simplifying
11x2 + -33x + -398 = 0

Reorder the terms:
-398 + -33x + 11x2 = 0

Solving
-398 + -33x + 11x2 = 0

Solving for variable 'x'.

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

Divide each side by '11'.
-36.18181818 + -3x + x2 = 0

Move the constant term to the right:

Add '36.18181818' to each side of the equation.
-36.18181818 + -3x + 36.18181818 + x2 = 0 + 36.18181818

Reorder the terms:
-36.18181818 + 36.18181818 + -3x + x2 = 0 + 36.18181818

Combine like terms: -36.18181818 + 36.18181818 = 0.00000000
0.00000000 + -3x + x2 = 0 + 36.18181818
-3x + x2 = 0 + 36.18181818

Combine like terms: 0 + 36.18181818 = 36.18181818
-3x + x2 = 36.18181818

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 36.18181818 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 36.18181818 + 2.25

Combine like terms: 36.18181818 + 2.25 = 38.43181818
2.25 + -3x + x2 = 38.43181818

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 38.43181818

Calculate the square root of the right side: 6.199340141

Break this problem into two subproblems by setting 
(x + -1.5) equal to 6.199340141 and -6.199340141.

Subproblem 1

x + -1.5 = 6.199340141 Simplifying x + -1.5 = 6.199340141 Reorder the terms: -1.5 + x = 6.199340141 Solving -1.5 + x = 6.199340141 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 6.199340141 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 6.199340141 + 1.5 x = 6.199340141 + 1.5 Combine like terms: 6.199340141 + 1.5 = 7.699340141 x = 7.699340141 Simplifying x = 7.699340141

Subproblem 2

x + -1.5 = -6.199340141 Simplifying x + -1.5 = -6.199340141 Reorder the terms: -1.5 + x = -6.199340141 Solving -1.5 + x = -6.199340141 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -6.199340141 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -6.199340141 + 1.5 x = -6.199340141 + 1.5 Combine like terms: -6.199340141 + 1.5 = -4.699340141 x = -4.699340141 Simplifying x = -4.699340141

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.699340141, -4.699340141}

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