0.6111x^2-7x-56=0

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Solution for 0.6111x^2-7x-56=0 equation:


Simplifying
0.6111x2 + -7x + -56 = 0

Reorder the terms:
-56 + -7x + 0.6111x2 = 0

Solving
-56 + -7x + 0.6111x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
0.6111 the coefficient of the squared term: 

Divide each side by '0.6111'.
-91.63802978 + -11.45475372x + x2 = 0

Move the constant term to the right:

Add '91.63802978' to each side of the equation.
-91.63802978 + -11.45475372x + 91.63802978 + x2 = 0 + 91.63802978

Reorder the terms:
-91.63802978 + 91.63802978 + -11.45475372x + x2 = 0 + 91.63802978

Combine like terms: -91.63802978 + 91.63802978 = 0.00000000
0.00000000 + -11.45475372x + x2 = 0 + 91.63802978
-11.45475372x + x2 = 0 + 91.63802978

Combine like terms: 0 + 91.63802978 = 91.63802978
-11.45475372x + x2 = 91.63802978

The x term is -11.45475372x.  Take half its coefficient (-5.72737686).
Square it (32.80284570) and add it to both sides.

Add '32.80284570' to each side of the equation.
-11.45475372x + 32.80284570 + x2 = 91.63802978 + 32.80284570

Reorder the terms:
32.80284570 + -11.45475372x + x2 = 91.63802978 + 32.80284570

Combine like terms: 91.63802978 + 32.80284570 = 124.44087548
32.80284570 + -11.45475372x + x2 = 124.44087548

Factor a perfect square on the left side:
(x + -5.72737686)(x + -5.72737686) = 124.44087548

Calculate the square root of the right side: 11.155307054

Break this problem into two subproblems by setting 
(x + -5.72737686) equal to 11.155307054 and -11.155307054.

Subproblem 1

x + -5.72737686 = 11.155307054 Simplifying x + -5.72737686 = 11.155307054 Reorder the terms: -5.72737686 + x = 11.155307054 Solving -5.72737686 + x = 11.155307054 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.72737686' to each side of the equation. -5.72737686 + 5.72737686 + x = 11.155307054 + 5.72737686 Combine like terms: -5.72737686 + 5.72737686 = 0.00000000 0.00000000 + x = 11.155307054 + 5.72737686 x = 11.155307054 + 5.72737686 Combine like terms: 11.155307054 + 5.72737686 = 16.882683914 x = 16.882683914 Simplifying x = 16.882683914

Subproblem 2

x + -5.72737686 = -11.155307054 Simplifying x + -5.72737686 = -11.155307054 Reorder the terms: -5.72737686 + x = -11.155307054 Solving -5.72737686 + x = -11.155307054 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.72737686' to each side of the equation. -5.72737686 + 5.72737686 + x = -11.155307054 + 5.72737686 Combine like terms: -5.72737686 + 5.72737686 = 0.00000000 0.00000000 + x = -11.155307054 + 5.72737686 x = -11.155307054 + 5.72737686 Combine like terms: -11.155307054 + 5.72737686 = -5.427930194 x = -5.427930194 Simplifying x = -5.427930194

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.882683914, -5.427930194}

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