6x+3=8x(x-4)+11x

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Solution for 6x+3=8x(x-4)+11x equation:


Simplifying
6x + 3 = 8x(x + -4) + 11x

Reorder the terms:
3 + 6x = 8x(x + -4) + 11x

Reorder the terms:
3 + 6x = 8x(-4 + x) + 11x
3 + 6x = (-4 * 8x + x * 8x) + 11x
3 + 6x = (-32x + 8x2) + 11x

Reorder the terms:
3 + 6x = -32x + 11x + 8x2

Combine like terms: -32x + 11x = -21x
3 + 6x = -21x + 8x2

Solving
3 + 6x = -21x + 8x2

Solving for variable 'x'.

Combine like terms: 6x + 21x = 27x
3 + 27x + -8x2 = -21x + 8x2 + 21x + -8x2

Reorder the terms:
3 + 27x + -8x2 = -21x + 21x + 8x2 + -8x2

Combine like terms: -21x + 21x = 0
3 + 27x + -8x2 = 0 + 8x2 + -8x2
3 + 27x + -8x2 = 8x2 + -8x2

Combine like terms: 8x2 + -8x2 = 0
3 + 27x + -8x2 = 0

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
-0.375 + -3.375x + x2 = 0

Move the constant term to the right:

Add '0.375' to each side of the equation.
-0.375 + -3.375x + 0.375 + x2 = 0 + 0.375

Reorder the terms:
-0.375 + 0.375 + -3.375x + x2 = 0 + 0.375

Combine like terms: -0.375 + 0.375 = 0.000
0.000 + -3.375x + x2 = 0 + 0.375
-3.375x + x2 = 0 + 0.375

Combine like terms: 0 + 0.375 = 0.375
-3.375x + x2 = 0.375

The x term is -3.375x.  Take half its coefficient (-1.6875).
Square it (2.84765625) and add it to both sides.

Add '2.84765625' to each side of the equation.
-3.375x + 2.84765625 + x2 = 0.375 + 2.84765625

Reorder the terms:
2.84765625 + -3.375x + x2 = 0.375 + 2.84765625

Combine like terms: 0.375 + 2.84765625 = 3.22265625
2.84765625 + -3.375x + x2 = 3.22265625

Factor a perfect square on the left side:
(x + -1.6875)(x + -1.6875) = 3.22265625

Calculate the square root of the right side: 1.795175827

Break this problem into two subproblems by setting 
(x + -1.6875) equal to 1.795175827 and -1.795175827.

Subproblem 1

x + -1.6875 = 1.795175827 Simplifying x + -1.6875 = 1.795175827 Reorder the terms: -1.6875 + x = 1.795175827 Solving -1.6875 + x = 1.795175827 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6875' to each side of the equation. -1.6875 + 1.6875 + x = 1.795175827 + 1.6875 Combine like terms: -1.6875 + 1.6875 = 0.0000 0.0000 + x = 1.795175827 + 1.6875 x = 1.795175827 + 1.6875 Combine like terms: 1.795175827 + 1.6875 = 3.482675827 x = 3.482675827 Simplifying x = 3.482675827

Subproblem 2

x + -1.6875 = -1.795175827 Simplifying x + -1.6875 = -1.795175827 Reorder the terms: -1.6875 + x = -1.795175827 Solving -1.6875 + x = -1.795175827 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6875' to each side of the equation. -1.6875 + 1.6875 + x = -1.795175827 + 1.6875 Combine like terms: -1.6875 + 1.6875 = 0.0000 0.0000 + x = -1.795175827 + 1.6875 x = -1.795175827 + 1.6875 Combine like terms: -1.795175827 + 1.6875 = -0.107675827 x = -0.107675827 Simplifying x = -0.107675827

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.482675827, -0.107675827}

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