7x-12x^2=-1

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Solution for 7x-12x^2=-1 equation:


Simplifying
7x + -12x2 = -1

Solving
7x + -12x2 = -1

Solving for variable 'x'.

Reorder the terms:
1 + 7x + -12x2 = -1 + 1

Combine like terms: -1 + 1 = 0
1 + 7x + -12x2 = 0

Begin completing the square.  Divide all terms by
-12 the coefficient of the squared term: 

Divide each side by '-12'.
-0.08333333333 + -0.5833333333x + x2 = 0

Move the constant term to the right:

Add '0.08333333333' to each side of the equation.
-0.08333333333 + -0.5833333333x + 0.08333333333 + x2 = 0 + 0.08333333333

Reorder the terms:
-0.08333333333 + 0.08333333333 + -0.5833333333x + x2 = 0 + 0.08333333333

Combine like terms: -0.08333333333 + 0.08333333333 = 0.00000000000
0.00000000000 + -0.5833333333x + x2 = 0 + 0.08333333333
-0.5833333333x + x2 = 0 + 0.08333333333

Combine like terms: 0 + 0.08333333333 = 0.08333333333
-0.5833333333x + x2 = 0.08333333333

The x term is -0.5833333333x.  Take half its coefficient (-0.2916666667).
Square it (0.08506944446) and add it to both sides.

Add '0.08506944446' to each side of the equation.
-0.5833333333x + 0.08506944446 + x2 = 0.08333333333 + 0.08506944446

Reorder the terms:
0.08506944446 + -0.5833333333x + x2 = 0.08333333333 + 0.08506944446

Combine like terms: 0.08333333333 + 0.08506944446 = 0.16840277779
0.08506944446 + -0.5833333333x + x2 = 0.16840277779

Factor a perfect square on the left side:
(x + -0.2916666667)(x + -0.2916666667) = 0.16840277779

Calculate the square root of the right side: 0.410369075

Break this problem into two subproblems by setting 
(x + -0.2916666667) equal to 0.410369075 and -0.410369075.

Subproblem 1

x + -0.2916666667 = 0.410369075 Simplifying x + -0.2916666667 = 0.410369075 Reorder the terms: -0.2916666667 + x = 0.410369075 Solving -0.2916666667 + x = 0.410369075 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2916666667' to each side of the equation. -0.2916666667 + 0.2916666667 + x = 0.410369075 + 0.2916666667 Combine like terms: -0.2916666667 + 0.2916666667 = 0.0000000000 0.0000000000 + x = 0.410369075 + 0.2916666667 x = 0.410369075 + 0.2916666667 Combine like terms: 0.410369075 + 0.2916666667 = 0.7020357417 x = 0.7020357417 Simplifying x = 0.7020357417

Subproblem 2

x + -0.2916666667 = -0.410369075 Simplifying x + -0.2916666667 = -0.410369075 Reorder the terms: -0.2916666667 + x = -0.410369075 Solving -0.2916666667 + x = -0.410369075 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2916666667' to each side of the equation. -0.2916666667 + 0.2916666667 + x = -0.410369075 + 0.2916666667 Combine like terms: -0.2916666667 + 0.2916666667 = 0.0000000000 0.0000000000 + x = -0.410369075 + 0.2916666667 x = -0.410369075 + 0.2916666667 Combine like terms: -0.410369075 + 0.2916666667 = -0.1187024083 x = -0.1187024083 Simplifying x = -0.1187024083

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.7020357417, -0.1187024083}

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