(3x-1)(x+5)=20

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Solution for (3x-1)(x+5)=20 equation:


Simplifying
(3x + -1)(x + 5) = 20

Reorder the terms:
(-1 + 3x)(x + 5) = 20

Reorder the terms:
(-1 + 3x)(5 + x) = 20

Multiply (-1 + 3x) * (5 + x)
(-1(5 + x) + 3x * (5 + x)) = 20
((5 * -1 + x * -1) + 3x * (5 + x)) = 20
((-5 + -1x) + 3x * (5 + x)) = 20
(-5 + -1x + (5 * 3x + x * 3x)) = 20
(-5 + -1x + (15x + 3x2)) = 20

Combine like terms: -1x + 15x = 14x
(-5 + 14x + 3x2) = 20

Solving
-5 + 14x + 3x2 = 20

Solving for variable 'x'.

Reorder the terms:
-5 + -20 + 14x + 3x2 = 20 + -20

Combine like terms: -5 + -20 = -25
-25 + 14x + 3x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-25 + 14x + 3x2 = 0

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

Divide each side by '3'.
-8.333333333 + 4.666666667x + x2 = 0

Move the constant term to the right:

Add '8.333333333' to each side of the equation.
-8.333333333 + 4.666666667x + 8.333333333 + x2 = 0 + 8.333333333

Reorder the terms:
-8.333333333 + 8.333333333 + 4.666666667x + x2 = 0 + 8.333333333

Combine like terms: -8.333333333 + 8.333333333 = 0.000000000
0.000000000 + 4.666666667x + x2 = 0 + 8.333333333
4.666666667x + x2 = 0 + 8.333333333

Combine like terms: 0 + 8.333333333 = 8.333333333
4.666666667x + x2 = 8.333333333

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 = 8.333333333 + 5.444444448

Reorder the terms:
5.444444448 + 4.666666667x + x2 = 8.333333333 + 5.444444448

Combine like terms: 8.333333333 + 5.444444448 = 13.777777781
5.444444448 + 4.666666667x + x2 = 13.777777781

Factor a perfect square on the left side:
(x + 2.333333334)(x + 2.333333334) = 13.777777781

Calculate the square root of the right side: 3.711842909

Break this problem into two subproblems by setting 
(x + 2.333333334) equal to 3.711842909 and -3.711842909.

Subproblem 1

x + 2.333333334 = 3.711842909 Simplifying x + 2.333333334 = 3.711842909 Reorder the terms: 2.333333334 + x = 3.711842909 Solving 2.333333334 + x = 3.711842909 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 = 3.711842909 + -2.333333334 Combine like terms: 2.333333334 + -2.333333334 = 0.000000000 0.000000000 + x = 3.711842909 + -2.333333334 x = 3.711842909 + -2.333333334 Combine like terms: 3.711842909 + -2.333333334 = 1.378509575 x = 1.378509575 Simplifying x = 1.378509575

Subproblem 2

x + 2.333333334 = -3.711842909 Simplifying x + 2.333333334 = -3.711842909 Reorder the terms: 2.333333334 + x = -3.711842909 Solving 2.333333334 + x = -3.711842909 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 = -3.711842909 + -2.333333334 Combine like terms: 2.333333334 + -2.333333334 = 0.000000000 0.000000000 + x = -3.711842909 + -2.333333334 x = -3.711842909 + -2.333333334 Combine like terms: -3.711842909 + -2.333333334 = -6.045176243 x = -6.045176243 Simplifying x = -6.045176243

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.378509575, -6.045176243}

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