(3x-1)(x+3)=65

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Solution for (3x-1)(x+3)=65 equation:


Simplifying
(3x + -1)(x + 3) = 65

Reorder the terms:
(-1 + 3x)(x + 3) = 65

Reorder the terms:
(-1 + 3x)(3 + x) = 65

Multiply (-1 + 3x) * (3 + x)
(-1(3 + x) + 3x * (3 + x)) = 65
((3 * -1 + x * -1) + 3x * (3 + x)) = 65
((-3 + -1x) + 3x * (3 + x)) = 65
(-3 + -1x + (3 * 3x + x * 3x)) = 65
(-3 + -1x + (9x + 3x2)) = 65

Combine like terms: -1x + 9x = 8x
(-3 + 8x + 3x2) = 65

Solving
-3 + 8x + 3x2 = 65

Solving for variable 'x'.

Reorder the terms:
-3 + -65 + 8x + 3x2 = 65 + -65

Combine like terms: -3 + -65 = -68
-68 + 8x + 3x2 = 65 + -65

Combine like terms: 65 + -65 = 0
-68 + 8x + 3x2 = 0

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

Divide each side by '3'.
-22.66666667 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '22.66666667' to each side of the equation.
-22.66666667 + 2.666666667x + 22.66666667 + x2 = 0 + 22.66666667

Reorder the terms:
-22.66666667 + 22.66666667 + 2.666666667x + x2 = 0 + 22.66666667

Combine like terms: -22.66666667 + 22.66666667 = 0.00000000
0.00000000 + 2.666666667x + x2 = 0 + 22.66666667
2.666666667x + x2 = 0 + 22.66666667

Combine like terms: 0 + 22.66666667 = 22.66666667
2.666666667x + x2 = 22.66666667

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = 22.66666667 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 22.66666667 + 1.777777780

Combine like terms: 22.66666667 + 1.777777780 = 24.44444445
1.777777780 + 2.666666667x + x2 = 24.44444445

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 24.44444445

Calculate the square root of the right side: 4.944132325

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 4.944132325 and -4.944132325.

Subproblem 1

x + 1.333333334 = 4.944132325 Simplifying x + 1.333333334 = 4.944132325 Reorder the terms: 1.333333334 + x = 4.944132325 Solving 1.333333334 + x = 4.944132325 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 4.944132325 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 4.944132325 + -1.333333334 x = 4.944132325 + -1.333333334 Combine like terms: 4.944132325 + -1.333333334 = 3.610798991 x = 3.610798991 Simplifying x = 3.610798991

Subproblem 2

x + 1.333333334 = -4.944132325 Simplifying x + 1.333333334 = -4.944132325 Reorder the terms: 1.333333334 + x = -4.944132325 Solving 1.333333334 + x = -4.944132325 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -4.944132325 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -4.944132325 + -1.333333334 x = -4.944132325 + -1.333333334 Combine like terms: -4.944132325 + -1.333333334 = -6.277465659 x = -6.277465659 Simplifying x = -6.277465659

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.610798991, -6.277465659}

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