6x(5x+6)=-1

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Solution for 6x(5x+6)=-1 equation:


Simplifying
6x(5x + 6) = -1

Reorder the terms:
6x(6 + 5x) = -1
(6 * 6x + 5x * 6x) = -1
(36x + 30x2) = -1

Solving
36x + 30x2 = -1

Solving for variable 'x'.

Reorder the terms:
1 + 36x + 30x2 = -1 + 1

Combine like terms: -1 + 1 = 0
1 + 36x + 30x2 = 0

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

Divide each side by '30'.
0.03333333333 + 1.2x + x2 = 0.0

Move the constant term to the right:

Add '-0.03333333333' to each side of the equation.
0.03333333333 + 1.2x + -0.03333333333 + x2 = 0.0 + -0.03333333333

Reorder the terms:
0.03333333333 + -0.03333333333 + 1.2x + x2 = 0.0 + -0.03333333333

Combine like terms: 0.03333333333 + -0.03333333333 = 0.00000000000
0.00000000000 + 1.2x + x2 = 0.0 + -0.03333333333
1.2x + x2 = 0.0 + -0.03333333333

Combine like terms: 0.0 + -0.03333333333 = -0.03333333333
1.2x + x2 = -0.03333333333

The x term is 1.2x.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2x + 0.36 + x2 = -0.03333333333 + 0.36

Reorder the terms:
0.36 + 1.2x + x2 = -0.03333333333 + 0.36

Combine like terms: -0.03333333333 + 0.36 = 0.32666666667
0.36 + 1.2x + x2 = 0.32666666667

Factor a perfect square on the left side:
(x + 0.6)(x + 0.6) = 0.32666666667

Calculate the square root of the right side: 0.571547607

Break this problem into two subproblems by setting 
(x + 0.6) equal to 0.571547607 and -0.571547607.

Subproblem 1

x + 0.6 = 0.571547607 Simplifying x + 0.6 = 0.571547607 Reorder the terms: 0.6 + x = 0.571547607 Solving 0.6 + x = 0.571547607 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = 0.571547607 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = 0.571547607 + -0.6 x = 0.571547607 + -0.6 Combine like terms: 0.571547607 + -0.6 = -0.028452393 x = -0.028452393 Simplifying x = -0.028452393

Subproblem 2

x + 0.6 = -0.571547607 Simplifying x + 0.6 = -0.571547607 Reorder the terms: 0.6 + x = -0.571547607 Solving 0.6 + x = -0.571547607 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = -0.571547607 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = -0.571547607 + -0.6 x = -0.571547607 + -0.6 Combine like terms: -0.571547607 + -0.6 = -1.171547607 x = -1.171547607 Simplifying x = -1.171547607

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.028452393, -1.171547607}

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