3(x-4)(x-9)=122

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Solution for 3(x-4)(x-9)=122 equation:


Simplifying
3(x + -4)(x + -9) = 122

Reorder the terms:
3(-4 + x)(x + -9) = 122

Reorder the terms:
3(-4 + x)(-9 + x) = 122

Multiply (-4 + x) * (-9 + x)
3(-4(-9 + x) + x(-9 + x)) = 122
3((-9 * -4 + x * -4) + x(-9 + x)) = 122
3((36 + -4x) + x(-9 + x)) = 122
3(36 + -4x + (-9 * x + x * x)) = 122
3(36 + -4x + (-9x + x2)) = 122

Combine like terms: -4x + -9x = -13x
3(36 + -13x + x2) = 122
(36 * 3 + -13x * 3 + x2 * 3) = 122
(108 + -39x + 3x2) = 122

Solving
108 + -39x + 3x2 = 122

Solving for variable 'x'.

Reorder the terms:
108 + -122 + -39x + 3x2 = 122 + -122

Combine like terms: 108 + -122 = -14
-14 + -39x + 3x2 = 122 + -122

Combine like terms: 122 + -122 = 0
-14 + -39x + 3x2 = 0

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

Divide each side by '3'.
-4.666666667 + -13x + x2 = 0

Move the constant term to the right:

Add '4.666666667' to each side of the equation.
-4.666666667 + -13x + 4.666666667 + x2 = 0 + 4.666666667

Reorder the terms:
-4.666666667 + 4.666666667 + -13x + x2 = 0 + 4.666666667

Combine like terms: -4.666666667 + 4.666666667 = 0.000000000
0.000000000 + -13x + x2 = 0 + 4.666666667
-13x + x2 = 0 + 4.666666667

Combine like terms: 0 + 4.666666667 = 4.666666667
-13x + x2 = 4.666666667

The x term is -13x.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13x + 42.25 + x2 = 4.666666667 + 42.25

Reorder the terms:
42.25 + -13x + x2 = 4.666666667 + 42.25

Combine like terms: 4.666666667 + 42.25 = 46.916666667
42.25 + -13x + x2 = 46.916666667

Factor a perfect square on the left side:
(x + -6.5)(x + -6.5) = 46.916666667

Calculate the square root of the right side: 6.849574196

Break this problem into two subproblems by setting 
(x + -6.5) equal to 6.849574196 and -6.849574196.

Subproblem 1

x + -6.5 = 6.849574196 Simplifying x + -6.5 = 6.849574196 Reorder the terms: -6.5 + x = 6.849574196 Solving -6.5 + x = 6.849574196 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = 6.849574196 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = 6.849574196 + 6.5 x = 6.849574196 + 6.5 Combine like terms: 6.849574196 + 6.5 = 13.349574196 x = 13.349574196 Simplifying x = 13.349574196

Subproblem 2

x + -6.5 = -6.849574196 Simplifying x + -6.5 = -6.849574196 Reorder the terms: -6.5 + x = -6.849574196 Solving -6.5 + x = -6.849574196 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = -6.849574196 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = -6.849574196 + 6.5 x = -6.849574196 + 6.5 Combine like terms: -6.849574196 + 6.5 = -0.349574196 x = -0.349574196 Simplifying x = -0.349574196

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.349574196, -0.349574196}

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