6x^2+x-72=0

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Solution for 6x^2+x-72=0 equation:


Simplifying
6x2 + x + -72 = 0

Reorder the terms:
-72 + x + 6x2 = 0

Solving
-72 + x + 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'.
-12 + 0.1666666667x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 0.1666666667x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + 0.1666666667x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 0.1666666667x + x2 = 0 + 12
0.1666666667x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
0.1666666667x + x2 = 12

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.
0.1666666667x + 0.25 + x2 = 12 + 0.25

Reorder the terms:
0.25 + 0.1666666667x + x2 = 12 + 0.25

Combine like terms: 12 + 0.25 = 12.25
0.25 + 0.1666666667x + x2 = 12.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 12.25

Calculate the square root of the right side: 3.5

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.5 and -3.5.

Subproblem 1

x + 0.5 = 3.5 Simplifying x + 0.5 = 3.5 Reorder the terms: 0.5 + x = 3.5 Solving 0.5 + x = 3.5 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 = 3.5 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.5 + -0.5 x = 3.5 + -0.5 Combine like terms: 3.5 + -0.5 = 3 x = 3 Simplifying x = 3

Subproblem 2

x + 0.5 = -3.5 Simplifying x + 0.5 = -3.5 Reorder the terms: 0.5 + x = -3.5 Solving 0.5 + x = -3.5 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 = -3.5 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.5 + -0.5 x = -3.5 + -0.5 Combine like terms: -3.5 + -0.5 = -4 x = -4 Simplifying x = -4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3, -4}

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