(3x-1)(x+5)=30

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Solution for (3x-1)(x+5)=30 equation:


Simplifying
(3x + -1)(x + 5) = 30

Reorder the terms:
(-1 + 3x)(x + 5) = 30

Reorder the terms:
(-1 + 3x)(5 + x) = 30

Multiply (-1 + 3x) * (5 + x)
(-1(5 + x) + 3x * (5 + x)) = 30
((5 * -1 + x * -1) + 3x * (5 + x)) = 30
((-5 + -1x) + 3x * (5 + x)) = 30
(-5 + -1x + (5 * 3x + x * 3x)) = 30
(-5 + -1x + (15x + 3x2)) = 30

Combine like terms: -1x + 15x = 14x
(-5 + 14x + 3x2) = 30

Solving
-5 + 14x + 3x2 = 30

Solving for variable 'x'.

Reorder the terms:
-5 + -30 + 14x + 3x2 = 30 + -30

Combine like terms: -5 + -30 = -35
-35 + 14x + 3x2 = 30 + -30

Combine like terms: 30 + -30 = 0
-35 + 14x + 3x2 = 0

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

Divide each side by '3'.
-11.66666667 + 4.666666667x + x2 = 0

Move the constant term to the right:

Add '11.66666667' to each side of the equation.
-11.66666667 + 4.666666667x + 11.66666667 + x2 = 0 + 11.66666667

Reorder the terms:
-11.66666667 + 11.66666667 + 4.666666667x + x2 = 0 + 11.66666667

Combine like terms: -11.66666667 + 11.66666667 = 0.00000000
0.00000000 + 4.666666667x + x2 = 0 + 11.66666667
4.666666667x + x2 = 0 + 11.66666667

Combine like terms: 0 + 11.66666667 = 11.66666667
4.666666667x + x2 = 11.66666667

The x term is 4.666666667x.  Take half its coefficient (2.333333334).
Square it (5.444444448) and add it to both sides.

Add '5.444444448' to each side of the equation.
4.666666667x + 5.444444448 + x2 = 11.66666667 + 5.444444448

Reorder the terms:
5.444444448 + 4.666666667x + x2 = 11.66666667 + 5.444444448

Combine like terms: 11.66666667 + 5.444444448 = 17.111111118
5.444444448 + 4.666666667x + x2 = 17.111111118

Factor a perfect square on the left side:
(x + 2.333333334)(x + 2.333333334) = 17.111111118

Calculate the square root of the right side: 4.136557883

Break this problem into two subproblems by setting 
(x + 2.333333334) equal to 4.136557883 and -4.136557883.

Subproblem 1

x + 2.333333334 = 4.136557883 Simplifying x + 2.333333334 = 4.136557883 Reorder the terms: 2.333333334 + x = 4.136557883 Solving 2.333333334 + x = 4.136557883 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.333333334' to each side of the equation. 2.333333334 + -2.333333334 + x = 4.136557883 + -2.333333334 Combine like terms: 2.333333334 + -2.333333334 = 0.000000000 0.000000000 + x = 4.136557883 + -2.333333334 x = 4.136557883 + -2.333333334 Combine like terms: 4.136557883 + -2.333333334 = 1.803224549 x = 1.803224549 Simplifying x = 1.803224549

Subproblem 2

x + 2.333333334 = -4.136557883 Simplifying x + 2.333333334 = -4.136557883 Reorder the terms: 2.333333334 + x = -4.136557883 Solving 2.333333334 + x = -4.136557883 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.333333334' to each side of the equation. 2.333333334 + -2.333333334 + x = -4.136557883 + -2.333333334 Combine like terms: 2.333333334 + -2.333333334 = 0.000000000 0.000000000 + x = -4.136557883 + -2.333333334 x = -4.136557883 + -2.333333334 Combine like terms: -4.136557883 + -2.333333334 = -6.469891217 x = -6.469891217 Simplifying x = -6.469891217

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.803224549, -6.469891217}

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