(6x-1)(x+5)=7

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Solution for (6x-1)(x+5)=7 equation:


Simplifying
(6x + -1)(x + 5) = 7

Reorder the terms:
(-1 + 6x)(x + 5) = 7

Reorder the terms:
(-1 + 6x)(5 + x) = 7

Multiply (-1 + 6x) * (5 + x)
(-1(5 + x) + 6x * (5 + x)) = 7
((5 * -1 + x * -1) + 6x * (5 + x)) = 7
((-5 + -1x) + 6x * (5 + x)) = 7
(-5 + -1x + (5 * 6x + x * 6x)) = 7
(-5 + -1x + (30x + 6x2)) = 7

Combine like terms: -1x + 30x = 29x
(-5 + 29x + 6x2) = 7

Solving
-5 + 29x + 6x2 = 7

Solving for variable 'x'.

Reorder the terms:
-5 + -7 + 29x + 6x2 = 7 + -7

Combine like terms: -5 + -7 = -12
-12 + 29x + 6x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-12 + 29x + 6x2 = 0

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

Divide each side by '6'.
-2 + 4.833333333x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 4.833333333x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 4.833333333x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 4.833333333x + x2 = 0 + 2
4.833333333x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
4.833333333x + x2 = 2

The x term is 4.833333333x.  Take half its coefficient (2.416666667).
Square it (5.840277779) and add it to both sides.

Add '5.840277779' to each side of the equation.
4.833333333x + 5.840277779 + x2 = 2 + 5.840277779

Reorder the terms:
5.840277779 + 4.833333333x + x2 = 2 + 5.840277779

Combine like terms: 2 + 5.840277779 = 7.840277779
5.840277779 + 4.833333333x + x2 = 7.840277779

Factor a perfect square on the left side:
(x + 2.416666667)(x + 2.416666667) = 7.840277779

Calculate the square root of the right side: 2.800049603

Break this problem into two subproblems by setting 
(x + 2.416666667) equal to 2.800049603 and -2.800049603.

Subproblem 1

x + 2.416666667 = 2.800049603 Simplifying x + 2.416666667 = 2.800049603 Reorder the terms: 2.416666667 + x = 2.800049603 Solving 2.416666667 + x = 2.800049603 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.416666667' to each side of the equation. 2.416666667 + -2.416666667 + x = 2.800049603 + -2.416666667 Combine like terms: 2.416666667 + -2.416666667 = 0.000000000 0.000000000 + x = 2.800049603 + -2.416666667 x = 2.800049603 + -2.416666667 Combine like terms: 2.800049603 + -2.416666667 = 0.383382936 x = 0.383382936 Simplifying x = 0.383382936

Subproblem 2

x + 2.416666667 = -2.800049603 Simplifying x + 2.416666667 = -2.800049603 Reorder the terms: 2.416666667 + x = -2.800049603 Solving 2.416666667 + x = -2.800049603 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.416666667' to each side of the equation. 2.416666667 + -2.416666667 + x = -2.800049603 + -2.416666667 Combine like terms: 2.416666667 + -2.416666667 = 0.000000000 0.000000000 + x = -2.800049603 + -2.416666667 x = -2.800049603 + -2.416666667 Combine like terms: -2.800049603 + -2.416666667 = -5.21671627 x = -5.21671627 Simplifying x = -5.21671627

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.383382936, -5.21671627}

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