x=(7x+1)(x-3)

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Solution for x=(7x+1)(x-3) equation:


Simplifying
x = (7x + 1)(x + -3)

Reorder the terms:
x = (1 + 7x)(x + -3)

Reorder the terms:
x = (1 + 7x)(-3 + x)

Multiply (1 + 7x) * (-3 + x)
x = (1(-3 + x) + 7x * (-3 + x))
x = ((-3 * 1 + x * 1) + 7x * (-3 + x))
x = ((-3 + 1x) + 7x * (-3 + x))
x = (-3 + 1x + (-3 * 7x + x * 7x))
x = (-3 + 1x + (-21x + 7x2))

Combine like terms: 1x + -21x = -20x
x = (-3 + -20x + 7x2)

Solving
x = -3 + -20x + 7x2

Solving for variable 'x'.

Reorder the terms:
3 + x + 20x + -7x2 = -3 + -20x + 7x2 + 3 + 20x + -7x2

Combine like terms: x + 20x = 21x
3 + 21x + -7x2 = -3 + -20x + 7x2 + 3 + 20x + -7x2

Reorder the terms:
3 + 21x + -7x2 = -3 + 3 + -20x + 20x + 7x2 + -7x2

Combine like terms: -3 + 3 = 0
3 + 21x + -7x2 = 0 + -20x + 20x + 7x2 + -7x2
3 + 21x + -7x2 = -20x + 20x + 7x2 + -7x2

Combine like terms: -20x + 20x = 0
3 + 21x + -7x2 = 0 + 7x2 + -7x2
3 + 21x + -7x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
3 + 21x + -7x2 = 0

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
-0.4285714286 + -3x + x2 = 0

Move the constant term to the right:

Add '0.4285714286' to each side of the equation.
-0.4285714286 + -3x + 0.4285714286 + x2 = 0 + 0.4285714286

Reorder the terms:
-0.4285714286 + 0.4285714286 + -3x + x2 = 0 + 0.4285714286

Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000
0.0000000000 + -3x + x2 = 0 + 0.4285714286
-3x + x2 = 0 + 0.4285714286

Combine like terms: 0 + 0.4285714286 = 0.4285714286
-3x + x2 = 0.4285714286

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 0.4285714286 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 0.4285714286 + 2.25

Combine like terms: 0.4285714286 + 2.25 = 2.6785714286
2.25 + -3x + x2 = 2.6785714286

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 2.6785714286

Calculate the square root of the right side: 1.636634177

Break this problem into two subproblems by setting 
(x + -1.5) equal to 1.636634177 and -1.636634177.

Subproblem 1

x + -1.5 = 1.636634177 Simplifying x + -1.5 = 1.636634177 Reorder the terms: -1.5 + x = 1.636634177 Solving -1.5 + x = 1.636634177 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 1.636634177 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 1.636634177 + 1.5 x = 1.636634177 + 1.5 Combine like terms: 1.636634177 + 1.5 = 3.136634177 x = 3.136634177 Simplifying x = 3.136634177

Subproblem 2

x + -1.5 = -1.636634177 Simplifying x + -1.5 = -1.636634177 Reorder the terms: -1.5 + x = -1.636634177 Solving -1.5 + x = -1.636634177 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -1.636634177 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -1.636634177 + 1.5 x = -1.636634177 + 1.5 Combine like terms: -1.636634177 + 1.5 = -0.136634177 x = -0.136634177 Simplifying x = -0.136634177

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.136634177, -0.136634177}

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