5x^2-1.2x-6=0

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Solution for 5x^2-1.2x-6=0 equation:


Simplifying
5x2 + -1.2x + -6 = 0

Reorder the terms:
-6 + -1.2x + 5x2 = 0

Solving
-6 + -1.2x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-1.2 + -0.24x + x2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + -0.24x + 1.2 + x2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + -0.24x + x2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + -0.24x + x2 = 0 + 1.2
-0.24x + x2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
-0.24x + x2 = 1.2

The x term is -0.24x.  Take half its coefficient (-0.12).
Square it (0.0144) and add it to both sides.

Add '0.0144' to each side of the equation.
-0.24x + 0.0144 + x2 = 1.2 + 0.0144

Reorder the terms:
0.0144 + -0.24x + x2 = 1.2 + 0.0144

Combine like terms: 1.2 + 0.0144 = 1.2144
0.0144 + -0.24x + x2 = 1.2144

Factor a perfect square on the left side:
(x + -0.12)(x + -0.12) = 1.2144

Calculate the square root of the right side: 1.101998185

Break this problem into two subproblems by setting 
(x + -0.12) equal to 1.101998185 and -1.101998185.

Subproblem 1

x + -0.12 = 1.101998185 Simplifying x + -0.12 = 1.101998185 Reorder the terms: -0.12 + x = 1.101998185 Solving -0.12 + x = 1.101998185 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.12' to each side of the equation. -0.12 + 0.12 + x = 1.101998185 + 0.12 Combine like terms: -0.12 + 0.12 = 0.00 0.00 + x = 1.101998185 + 0.12 x = 1.101998185 + 0.12 Combine like terms: 1.101998185 + 0.12 = 1.221998185 x = 1.221998185 Simplifying x = 1.221998185

Subproblem 2

x + -0.12 = -1.101998185 Simplifying x + -0.12 = -1.101998185 Reorder the terms: -0.12 + x = -1.101998185 Solving -0.12 + x = -1.101998185 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.12' to each side of the equation. -0.12 + 0.12 + x = -1.101998185 + 0.12 Combine like terms: -0.12 + 0.12 = 0.00 0.00 + x = -1.101998185 + 0.12 x = -1.101998185 + 0.12 Combine like terms: -1.101998185 + 0.12 = -0.981998185 x = -0.981998185 Simplifying x = -0.981998185

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.221998185, -0.981998185}

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