6x^2-9x-28=0

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Solution for 6x^2-9x-28=0 equation:


Simplifying
6x2 + -9x + -28 = 0

Reorder the terms:
-28 + -9x + 6x2 = 0

Solving
-28 + -9x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-4.666666667 + -1.5x + x2 = 0

Move the constant term to the right:

Add '4.666666667' to each side of the equation.
-4.666666667 + -1.5x + 4.666666667 + x2 = 0 + 4.666666667

Reorder the terms:
-4.666666667 + 4.666666667 + -1.5x + x2 = 0 + 4.666666667

Combine like terms: -4.666666667 + 4.666666667 = 0.000000000
0.000000000 + -1.5x + x2 = 0 + 4.666666667
-1.5x + x2 = 0 + 4.666666667

Combine like terms: 0 + 4.666666667 = 4.666666667
-1.5x + x2 = 4.666666667

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 4.666666667 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 4.666666667 + 0.5625

Combine like terms: 4.666666667 + 0.5625 = 5.229166667
0.5625 + -1.5x + x2 = 5.229166667

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 5.229166667

Calculate the square root of the right side: 2.286737122

Break this problem into two subproblems by setting 
(x + -0.75) equal to 2.286737122 and -2.286737122.

Subproblem 1

x + -0.75 = 2.286737122 Simplifying x + -0.75 = 2.286737122 Reorder the terms: -0.75 + x = 2.286737122 Solving -0.75 + x = 2.286737122 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 2.286737122 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 2.286737122 + 0.75 x = 2.286737122 + 0.75 Combine like terms: 2.286737122 + 0.75 = 3.036737122 x = 3.036737122 Simplifying x = 3.036737122

Subproblem 2

x + -0.75 = -2.286737122 Simplifying x + -0.75 = -2.286737122 Reorder the terms: -0.75 + x = -2.286737122 Solving -0.75 + x = -2.286737122 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -2.286737122 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -2.286737122 + 0.75 x = -2.286737122 + 0.75 Combine like terms: -2.286737122 + 0.75 = -1.536737122 x = -1.536737122 Simplifying x = -1.536737122

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.036737122, -1.536737122}

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