-3x(x+1)=8x-47

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Solution for -3x(x+1)=8x-47 equation:


Simplifying
-3x(x + 1) = 8x + -47

Reorder the terms:
-3x(1 + x) = 8x + -47
(1 * -3x + x * -3x) = 8x + -47
(-3x + -3x2) = 8x + -47

Reorder the terms:
-3x + -3x2 = -47 + 8x

Solving
-3x + -3x2 = -47 + 8x

Solving for variable 'x'.

Reorder the terms:
47 + -3x + -8x + -3x2 = -47 + 8x + 47 + -8x

Combine like terms: -3x + -8x = -11x
47 + -11x + -3x2 = -47 + 8x + 47 + -8x

Reorder the terms:
47 + -11x + -3x2 = -47 + 47 + 8x + -8x

Combine like terms: -47 + 47 = 0
47 + -11x + -3x2 = 0 + 8x + -8x
47 + -11x + -3x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
47 + -11x + -3x2 = 0

Begin completing the square.  Divide all terms by
-3 the coefficient of the squared term: 

Divide each side by '-3'.
-15.66666667 + 3.666666667x + x2 = 0

Move the constant term to the right:

Add '15.66666667' to each side of the equation.
-15.66666667 + 3.666666667x + 15.66666667 + x2 = 0 + 15.66666667

Reorder the terms:
-15.66666667 + 15.66666667 + 3.666666667x + x2 = 0 + 15.66666667

Combine like terms: -15.66666667 + 15.66666667 = 0.00000000
0.00000000 + 3.666666667x + x2 = 0 + 15.66666667
3.666666667x + x2 = 0 + 15.66666667

Combine like terms: 0 + 15.66666667 = 15.66666667
3.666666667x + x2 = 15.66666667

The x term is 3.666666667x.  Take half its coefficient (1.833333334).
Square it (3.361111114) and add it to both sides.

Add '3.361111114' to each side of the equation.
3.666666667x + 3.361111114 + x2 = 15.66666667 + 3.361111114

Reorder the terms:
3.361111114 + 3.666666667x + x2 = 15.66666667 + 3.361111114

Combine like terms: 15.66666667 + 3.361111114 = 19.027777784
3.361111114 + 3.666666667x + x2 = 19.027777784

Factor a perfect square on the left side:
(x + 1.833333334)(x + 1.833333334) = 19.027777784

Calculate the square root of the right side: 4.36208411

Break this problem into two subproblems by setting 
(x + 1.833333334) equal to 4.36208411 and -4.36208411.

Subproblem 1

x + 1.833333334 = 4.36208411 Simplifying x + 1.833333334 = 4.36208411 Reorder the terms: 1.833333334 + x = 4.36208411 Solving 1.833333334 + x = 4.36208411 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.833333334' to each side of the equation. 1.833333334 + -1.833333334 + x = 4.36208411 + -1.833333334 Combine like terms: 1.833333334 + -1.833333334 = 0.000000000 0.000000000 + x = 4.36208411 + -1.833333334 x = 4.36208411 + -1.833333334 Combine like terms: 4.36208411 + -1.833333334 = 2.528750776 x = 2.528750776 Simplifying x = 2.528750776

Subproblem 2

x + 1.833333334 = -4.36208411 Simplifying x + 1.833333334 = -4.36208411 Reorder the terms: 1.833333334 + x = -4.36208411 Solving 1.833333334 + x = -4.36208411 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.833333334' to each side of the equation. 1.833333334 + -1.833333334 + x = -4.36208411 + -1.833333334 Combine like terms: 1.833333334 + -1.833333334 = 0.000000000 0.000000000 + x = -4.36208411 + -1.833333334 x = -4.36208411 + -1.833333334 Combine like terms: -4.36208411 + -1.833333334 = -6.195417444 x = -6.195417444 Simplifying x = -6.195417444

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.528750776, -6.195417444}

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