-2x-3x(6x-11)=-7

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Solution for -2x-3x(6x-11)=-7 equation:


Simplifying
-2x + -3x(6x + -11) = -7

Reorder the terms:
-2x + -3x(-11 + 6x) = -7
-2x + (-11 * -3x + 6x * -3x) = -7
-2x + (33x + -18x2) = -7

Combine like terms: -2x + 33x = 31x
31x + -18x2 = -7

Solving
31x + -18x2 = -7

Solving for variable 'x'.

Reorder the terms:
7 + 31x + -18x2 = -7 + 7

Combine like terms: -7 + 7 = 0
7 + 31x + -18x2 = 0

Begin completing the square.  Divide all terms by
-18 the coefficient of the squared term: 

Divide each side by '-18'.
-0.3888888889 + -1.722222222x + x2 = 0

Move the constant term to the right:

Add '0.3888888889' to each side of the equation.
-0.3888888889 + -1.722222222x + 0.3888888889 + x2 = 0 + 0.3888888889

Reorder the terms:
-0.3888888889 + 0.3888888889 + -1.722222222x + x2 = 0 + 0.3888888889

Combine like terms: -0.3888888889 + 0.3888888889 = 0.0000000000
0.0000000000 + -1.722222222x + x2 = 0 + 0.3888888889
-1.722222222x + x2 = 0 + 0.3888888889

Combine like terms: 0 + 0.3888888889 = 0.3888888889
-1.722222222x + x2 = 0.3888888889

The x term is -1.722222222x.  Take half its coefficient (-0.861111111).
Square it (0.7415123455) and add it to both sides.

Add '0.7415123455' to each side of the equation.
-1.722222222x + 0.7415123455 + x2 = 0.3888888889 + 0.7415123455

Reorder the terms:
0.7415123455 + -1.722222222x + x2 = 0.3888888889 + 0.7415123455

Combine like terms: 0.3888888889 + 0.7415123455 = 1.1304012344
0.7415123455 + -1.722222222x + x2 = 1.1304012344

Factor a perfect square on the left side:
(x + -0.861111111)(x + -0.861111111) = 1.1304012344

Calculate the square root of the right side: 1.063203289

Break this problem into two subproblems by setting 
(x + -0.861111111) equal to 1.063203289 and -1.063203289.

Subproblem 1

x + -0.861111111 = 1.063203289 Simplifying x + -0.861111111 = 1.063203289 Reorder the terms: -0.861111111 + x = 1.063203289 Solving -0.861111111 + x = 1.063203289 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.861111111' to each side of the equation. -0.861111111 + 0.861111111 + x = 1.063203289 + 0.861111111 Combine like terms: -0.861111111 + 0.861111111 = 0.000000000 0.000000000 + x = 1.063203289 + 0.861111111 x = 1.063203289 + 0.861111111 Combine like terms: 1.063203289 + 0.861111111 = 1.9243144 x = 1.9243144 Simplifying x = 1.9243144

Subproblem 2

x + -0.861111111 = -1.063203289 Simplifying x + -0.861111111 = -1.063203289 Reorder the terms: -0.861111111 + x = -1.063203289 Solving -0.861111111 + x = -1.063203289 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.861111111' to each side of the equation. -0.861111111 + 0.861111111 + x = -1.063203289 + 0.861111111 Combine like terms: -0.861111111 + 0.861111111 = 0.000000000 0.000000000 + x = -1.063203289 + 0.861111111 x = -1.063203289 + 0.861111111 Combine like terms: -1.063203289 + 0.861111111 = -0.202092178 x = -0.202092178 Simplifying x = -0.202092178

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.9243144, -0.202092178}

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