0=(4x^2)-x-6

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Solution for 0=(4x^2)-x-6 equation:


Simplifying
0 = (4x2) + -1x + -6

Reorder the terms:
0 = -6 + -1x + (4x2)

Solving
0 = -6 + -1x + (4x2)

Solving for variable 'x'.

Combine like terms: 0 + 6 = 6
6 + x + (-4x2) = -6 + -1x + (4x2) + 6 + x + (-4x2)

Reorder the terms:
6 + x + (-4x2) = -6 + 6 + -1x + x + (4x2) + (-4x2)

Combine like terms: -6 + 6 = 0
6 + x + (-4x2) = 0 + -1x + x + (4x2) + (-4x2)
6 + x + (-4x2) = -1x + x + (4x2) + (-4x2)

Combine like terms: -1x + x = 0
6 + x + (-4x2) = 0 + (4x2) + (-4x2)
6 + x + (-4x2) = (4x2) + (-4x2)

Combine like terms: (4x2) + (-4x2) = 0
6 + x + (-4x2) = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-1.5 + -0.25x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -0.25x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -0.25x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -0.25x + x2 = 0 + 1.5
-0.25x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-0.25x + x2 = 1.5

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-0.25x + 0.25 + x2 = 1.5 + 0.25

Reorder the terms:
0.25 + -0.25x + x2 = 1.5 + 0.25

Combine like terms: 1.5 + 0.25 = 1.75
0.25 + -0.25x + x2 = 1.75

Factor a perfect square on the left side:
((x) + 0.5)((x) + 0.5) = 1.75

Calculate the square root of the right side: 1.322875656

Break this problem into two subproblems by setting 
((x) + 0.5) equal to 1.322875656 and -1.322875656.

Subproblem 1

(x) + 0.5 = 1.322875656 Simplifying (x) + 0.5 = 1.322875656 x + 0.5 = 1.322875656 Reorder the terms: 0.5 + x = 1.322875656 Solving 0.5 + x = 1.322875656 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 1.322875656 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.322875656 + -0.5 x = 1.322875656 + -0.5 Combine like terms: 1.322875656 + -0.5 = 0.822875656 x = 0.822875656 Simplifying x = 0.822875656

Subproblem 2

(x) + 0.5 = -1.322875656 Simplifying (x) + 0.5 = -1.322875656 x + 0.5 = -1.322875656 Reorder the terms: 0.5 + x = -1.322875656 Solving 0.5 + x = -1.322875656 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -1.322875656 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.322875656 + -0.5 x = -1.322875656 + -0.5 Combine like terms: -1.322875656 + -0.5 = -1.822875656 x = -1.822875656 Simplifying x = -1.822875656

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.822875656, -1.822875656}

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