28x^2-3x-4=0

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Solution for 28x^2-3x-4=0 equation:


Simplifying
28x2 + -3x + -4 = 0

Reorder the terms:
-4 + -3x + 28x2 = 0

Solving
-4 + -3x + 28x2 = 0

Solving for variable 'x'.

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

Divide each side by '28'.
-0.1428571429 + -0.1071428571x + x2 = 0

Move the constant term to the right:

Add '0.1428571429' to each side of the equation.
-0.1428571429 + -0.1071428571x + 0.1428571429 + x2 = 0 + 0.1428571429

Reorder the terms:
-0.1428571429 + 0.1428571429 + -0.1071428571x + x2 = 0 + 0.1428571429

Combine like terms: -0.1428571429 + 0.1428571429 = 0.0000000000
0.0000000000 + -0.1071428571x + x2 = 0 + 0.1428571429
-0.1071428571x + x2 = 0 + 0.1428571429

Combine like terms: 0 + 0.1428571429 = 0.1428571429
-0.1071428571x + x2 = 0.1428571429

The x term is -0.1071428571x.  Take half its coefficient (-0.05357142855).
Square it (0.002869897957) and add it to both sides.

Add '0.002869897957' to each side of the equation.
-0.1071428571x + 0.002869897957 + x2 = 0.1428571429 + 0.002869897957

Reorder the terms:
0.002869897957 + -0.1071428571x + x2 = 0.1428571429 + 0.002869897957

Combine like terms: 0.1428571429 + 0.002869897957 = 0.145727040857
0.002869897957 + -0.1071428571x + x2 = 0.145727040857

Factor a perfect square on the left side:
(x + -0.05357142855)(x + -0.05357142855) = 0.145727040857

Calculate the square root of the right side: 0.381742113

Break this problem into two subproblems by setting 
(x + -0.05357142855) equal to 0.381742113 and -0.381742113.

Subproblem 1

x + -0.05357142855 = 0.381742113 Simplifying x + -0.05357142855 = 0.381742113 Reorder the terms: -0.05357142855 + x = 0.381742113 Solving -0.05357142855 + x = 0.381742113 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.05357142855' to each side of the equation. -0.05357142855 + 0.05357142855 + x = 0.381742113 + 0.05357142855 Combine like terms: -0.05357142855 + 0.05357142855 = 0.00000000000 0.00000000000 + x = 0.381742113 + 0.05357142855 x = 0.381742113 + 0.05357142855 Combine like terms: 0.381742113 + 0.05357142855 = 0.43531354155 x = 0.43531354155 Simplifying x = 0.43531354155

Subproblem 2

x + -0.05357142855 = -0.381742113 Simplifying x + -0.05357142855 = -0.381742113 Reorder the terms: -0.05357142855 + x = -0.381742113 Solving -0.05357142855 + x = -0.381742113 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.05357142855' to each side of the equation. -0.05357142855 + 0.05357142855 + x = -0.381742113 + 0.05357142855 Combine like terms: -0.05357142855 + 0.05357142855 = 0.00000000000 0.00000000000 + x = -0.381742113 + 0.05357142855 x = -0.381742113 + 0.05357142855 Combine like terms: -0.381742113 + 0.05357142855 = -0.32817068445 x = -0.32817068445 Simplifying x = -0.32817068445

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.43531354155, -0.32817068445}

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