3x(x-4)=x+29

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Solution for 3x(x-4)=x+29 equation:


Simplifying
3x(x + -4) = x + 29

Reorder the terms:
3x(-4 + x) = x + 29
(-4 * 3x + x * 3x) = x + 29
(-12x + 3x2) = x + 29

Reorder the terms:
-12x + 3x2 = 29 + x

Solving
-12x + 3x2 = 29 + x

Solving for variable 'x'.

Reorder the terms:
-29 + -12x + -1x + 3x2 = 29 + x + -29 + -1x

Combine like terms: -12x + -1x = -13x
-29 + -13x + 3x2 = 29 + x + -29 + -1x

Reorder the terms:
-29 + -13x + 3x2 = 29 + -29 + x + -1x

Combine like terms: 29 + -29 = 0
-29 + -13x + 3x2 = 0 + x + -1x
-29 + -13x + 3x2 = x + -1x

Combine like terms: x + -1x = 0
-29 + -13x + 3x2 = 0

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

Divide each side by '3'.
-9.666666667 + -4.333333333x + x2 = 0

Move the constant term to the right:

Add '9.666666667' to each side of the equation.
-9.666666667 + -4.333333333x + 9.666666667 + x2 = 0 + 9.666666667

Reorder the terms:
-9.666666667 + 9.666666667 + -4.333333333x + x2 = 0 + 9.666666667

Combine like terms: -9.666666667 + 9.666666667 = 0.000000000
0.000000000 + -4.333333333x + x2 = 0 + 9.666666667
-4.333333333x + x2 = 0 + 9.666666667

Combine like terms: 0 + 9.666666667 = 9.666666667
-4.333333333x + x2 = 9.666666667

The x term is -4.333333333x.  Take half its coefficient (-2.166666667).
Square it (4.694444446) and add it to both sides.

Add '4.694444446' to each side of the equation.
-4.333333333x + 4.694444446 + x2 = 9.666666667 + 4.694444446

Reorder the terms:
4.694444446 + -4.333333333x + x2 = 9.666666667 + 4.694444446

Combine like terms: 9.666666667 + 4.694444446 = 14.361111113
4.694444446 + -4.333333333x + x2 = 14.361111113

Factor a perfect square on the left side:
(x + -2.166666667)(x + -2.166666667) = 14.361111113

Calculate the square root of the right side: 3.789605667

Break this problem into two subproblems by setting 
(x + -2.166666667) equal to 3.789605667 and -3.789605667.

Subproblem 1

x + -2.166666667 = 3.789605667 Simplifying x + -2.166666667 = 3.789605667 Reorder the terms: -2.166666667 + x = 3.789605667 Solving -2.166666667 + x = 3.789605667 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.166666667' to each side of the equation. -2.166666667 + 2.166666667 + x = 3.789605667 + 2.166666667 Combine like terms: -2.166666667 + 2.166666667 = 0.000000000 0.000000000 + x = 3.789605667 + 2.166666667 x = 3.789605667 + 2.166666667 Combine like terms: 3.789605667 + 2.166666667 = 5.956272334 x = 5.956272334 Simplifying x = 5.956272334

Subproblem 2

x + -2.166666667 = -3.789605667 Simplifying x + -2.166666667 = -3.789605667 Reorder the terms: -2.166666667 + x = -3.789605667 Solving -2.166666667 + x = -3.789605667 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.166666667' to each side of the equation. -2.166666667 + 2.166666667 + x = -3.789605667 + 2.166666667 Combine like terms: -2.166666667 + 2.166666667 = 0.000000000 0.000000000 + x = -3.789605667 + 2.166666667 x = -3.789605667 + 2.166666667 Combine like terms: -3.789605667 + 2.166666667 = -1.622939 x = -1.622939 Simplifying x = -1.622939

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.956272334, -1.622939}

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