0.75x^2-x-2.67=0

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Solution for 0.75x^2-x-2.67=0 equation:


Simplifying
0.75x2 + -1x + -2.67 = 0

Reorder the terms:
-2.67 + -1x + 0.75x2 = 0

Solving
-2.67 + -1x + 0.75x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.75'.
-3.56 + -1.333333333x + x2 = 0

Move the constant term to the right:

Add '3.56' to each side of the equation.
-3.56 + -1.333333333x + 3.56 + x2 = 0 + 3.56

Reorder the terms:
-3.56 + 3.56 + -1.333333333x + x2 = 0 + 3.56

Combine like terms: -3.56 + 3.56 = 0.00
0.00 + -1.333333333x + x2 = 0 + 3.56
-1.333333333x + x2 = 0 + 3.56

Combine like terms: 0 + 3.56 = 3.56
-1.333333333x + x2 = 3.56

The x term is -1.333333333x.  Take half its coefficient (-0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
-1.333333333x + 0.4444444442 + x2 = 3.56 + 0.4444444442

Reorder the terms:
0.4444444442 + -1.333333333x + x2 = 3.56 + 0.4444444442

Combine like terms: 3.56 + 0.4444444442 = 4.0044444442
0.4444444442 + -1.333333333x + x2 = 4.0044444442

Factor a perfect square on the left side:
(x + -0.6666666665)(x + -0.6666666665) = 4.0044444442

Calculate the square root of the right side: 2.001110803

Break this problem into two subproblems by setting 
(x + -0.6666666665) equal to 2.001110803 and -2.001110803.

Subproblem 1

x + -0.6666666665 = 2.001110803 Simplifying x + -0.6666666665 = 2.001110803 Reorder the terms: -0.6666666665 + x = 2.001110803 Solving -0.6666666665 + x = 2.001110803 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + x = 2.001110803 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + x = 2.001110803 + 0.6666666665 x = 2.001110803 + 0.6666666665 Combine like terms: 2.001110803 + 0.6666666665 = 2.6677774695 x = 2.6677774695 Simplifying x = 2.6677774695

Subproblem 2

x + -0.6666666665 = -2.001110803 Simplifying x + -0.6666666665 = -2.001110803 Reorder the terms: -0.6666666665 + x = -2.001110803 Solving -0.6666666665 + x = -2.001110803 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + x = -2.001110803 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + x = -2.001110803 + 0.6666666665 x = -2.001110803 + 0.6666666665 Combine like terms: -2.001110803 + 0.6666666665 = -1.3344441365 x = -1.3344441365 Simplifying x = -1.3344441365

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.6677774695, -1.3344441365}

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