6x^2=-9x-1

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Solution for 6x^2=-9x-1 equation:


Simplifying
6x2 = -9x + -1

Reorder the terms:
6x2 = -1 + -9x

Solving
6x2 = -1 + -9x

Solving for variable 'x'.

Reorder the terms:
1 + 9x + 6x2 = -1 + -9x + 1 + 9x

Reorder the terms:
1 + 9x + 6x2 = -1 + 1 + -9x + 9x

Combine like terms: -1 + 1 = 0
1 + 9x + 6x2 = 0 + -9x + 9x
1 + 9x + 6x2 = -9x + 9x

Combine like terms: -9x + 9x = 0
1 + 9x + 6x2 = 0

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

Divide each side by '6'.
0.1666666667 + 1.5x + x2 = 0

Move the constant term to the right:

Add '-0.1666666667' to each side of the equation.
0.1666666667 + 1.5x + -0.1666666667 + x2 = 0 + -0.1666666667

Reorder the terms:
0.1666666667 + -0.1666666667 + 1.5x + x2 = 0 + -0.1666666667

Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000
0.0000000000 + 1.5x + x2 = 0 + -0.1666666667
1.5x + x2 = 0 + -0.1666666667

Combine like terms: 0 + -0.1666666667 = -0.1666666667
1.5x + x2 = -0.1666666667

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = -0.1666666667 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = -0.1666666667 + 0.5625

Combine like terms: -0.1666666667 + 0.5625 = 0.3958333333
0.5625 + 1.5x + x2 = 0.3958333333

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 0.3958333333

Calculate the square root of the right side: 0.62915287

Break this problem into two subproblems by setting 
(x + 0.75) equal to 0.62915287 and -0.62915287.

Subproblem 1

x + 0.75 = 0.62915287 Simplifying x + 0.75 = 0.62915287 Reorder the terms: 0.75 + x = 0.62915287 Solving 0.75 + x = 0.62915287 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 0.62915287 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 0.62915287 + -0.75 x = 0.62915287 + -0.75 Combine like terms: 0.62915287 + -0.75 = -0.12084713 x = -0.12084713 Simplifying x = -0.12084713

Subproblem 2

x + 0.75 = -0.62915287 Simplifying x + 0.75 = -0.62915287 Reorder the terms: 0.75 + x = -0.62915287 Solving 0.75 + x = -0.62915287 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -0.62915287 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -0.62915287 + -0.75 x = -0.62915287 + -0.75 Combine like terms: -0.62915287 + -0.75 = -1.37915287 x = -1.37915287 Simplifying x = -1.37915287

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.12084713, -1.37915287}

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