-6x(9x+5)-3x+4x=-408+8

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Solution for -6x(9x+5)-3x+4x=-408+8 equation:


Simplifying
-6x(9x + 5) + -3x + 4x = -408 + 8

Reorder the terms:
-6x(5 + 9x) + -3x + 4x = -408 + 8
(5 * -6x + 9x * -6x) + -3x + 4x = -408 + 8
(-30x + -54x2) + -3x + 4x = -408 + 8

Reorder the terms:
-30x + -3x + 4x + -54x2 = -408 + 8

Combine like terms: -30x + -3x = -33x
-33x + 4x + -54x2 = -408 + 8

Combine like terms: -33x + 4x = -29x
-29x + -54x2 = -408 + 8

Combine like terms: -408 + 8 = -400
-29x + -54x2 = -400

Solving
-29x + -54x2 = -400

Solving for variable 'x'.

Reorder the terms:
400 + -29x + -54x2 = -400 + 400

Combine like terms: -400 + 400 = 0
400 + -29x + -54x2 = 0

Begin completing the square.  Divide all terms by
-54 the coefficient of the squared term: 

Divide each side by '-54'.
-7.407407407 + 0.537037037x + x2 = 0

Move the constant term to the right:

Add '7.407407407' to each side of the equation.
-7.407407407 + 0.537037037x + 7.407407407 + x2 = 0 + 7.407407407

Reorder the terms:
-7.407407407 + 7.407407407 + 0.537037037x + x2 = 0 + 7.407407407

Combine like terms: -7.407407407 + 7.407407407 = 0.000000000
0.000000000 + 0.537037037x + x2 = 0 + 7.407407407
0.537037037x + x2 = 0 + 7.407407407

Combine like terms: 0 + 7.407407407 = 7.407407407
0.537037037x + x2 = 7.407407407

The x term is 0.537037037x.  Take half its coefficient (0.2685185185).
Square it (0.07210219478) and add it to both sides.

Add '0.07210219478' to each side of the equation.
0.537037037x + 0.07210219478 + x2 = 7.407407407 + 0.07210219478

Reorder the terms:
0.07210219478 + 0.537037037x + x2 = 7.407407407 + 0.07210219478

Combine like terms: 7.407407407 + 0.07210219478 = 7.47950960178
0.07210219478 + 0.537037037x + x2 = 7.47950960178

Factor a perfect square on the left side:
(x + 0.2685185185)(x + 0.2685185185) = 7.47950960178

Calculate the square root of the right side: 2.734869211

Break this problem into two subproblems by setting 
(x + 0.2685185185) equal to 2.734869211 and -2.734869211.

Subproblem 1

x + 0.2685185185 = 2.734869211 Simplifying x + 0.2685185185 = 2.734869211 Reorder the terms: 0.2685185185 + x = 2.734869211 Solving 0.2685185185 + x = 2.734869211 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2685185185' to each side of the equation. 0.2685185185 + -0.2685185185 + x = 2.734869211 + -0.2685185185 Combine like terms: 0.2685185185 + -0.2685185185 = 0.0000000000 0.0000000000 + x = 2.734869211 + -0.2685185185 x = 2.734869211 + -0.2685185185 Combine like terms: 2.734869211 + -0.2685185185 = 2.4663506925 x = 2.4663506925 Simplifying x = 2.4663506925

Subproblem 2

x + 0.2685185185 = -2.734869211 Simplifying x + 0.2685185185 = -2.734869211 Reorder the terms: 0.2685185185 + x = -2.734869211 Solving 0.2685185185 + x = -2.734869211 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2685185185' to each side of the equation. 0.2685185185 + -0.2685185185 + x = -2.734869211 + -0.2685185185 Combine like terms: 0.2685185185 + -0.2685185185 = 0.0000000000 0.0000000000 + x = -2.734869211 + -0.2685185185 x = -2.734869211 + -0.2685185185 Combine like terms: -2.734869211 + -0.2685185185 = -3.0033877295 x = -3.0033877295 Simplifying x = -3.0033877295

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.4663506925, -3.0033877295}

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