x=(5x-4)(5x+4)

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Solution for x=(5x-4)(5x+4) equation:


Simplifying
x = (5x + -4)(5x + 4)

Reorder the terms:
x = (-4 + 5x)(5x + 4)

Reorder the terms:
x = (-4 + 5x)(4 + 5x)

Multiply (-4 + 5x) * (4 + 5x)
x = (-4(4 + 5x) + 5x * (4 + 5x))
x = ((4 * -4 + 5x * -4) + 5x * (4 + 5x))
x = ((-16 + -20x) + 5x * (4 + 5x))
x = (-16 + -20x + (4 * 5x + 5x * 5x))
x = (-16 + -20x + (20x + 25x2))

Combine like terms: -20x + 20x = 0
x = (-16 + 0 + 25x2)
x = (-16 + 25x2)

Solving
x = -16 + 25x2

Solving for variable 'x'.

Reorder the terms:
16 + x + -25x2 = -16 + 25x2 + 16 + -25x2

Reorder the terms:
16 + x + -25x2 = -16 + 16 + 25x2 + -25x2

Combine like terms: -16 + 16 = 0
16 + x + -25x2 = 0 + 25x2 + -25x2
16 + x + -25x2 = 25x2 + -25x2

Combine like terms: 25x2 + -25x2 = 0
16 + x + -25x2 = 0

Begin completing the square.  Divide all terms by
-25 the coefficient of the squared term: 

Divide each side by '-25'.
-0.64 + -0.04x + x2 = 0

Move the constant term to the right:

Add '0.64' to each side of the equation.
-0.64 + -0.04x + 0.64 + x2 = 0 + 0.64

Reorder the terms:
-0.64 + 0.64 + -0.04x + x2 = 0 + 0.64

Combine like terms: -0.64 + 0.64 = 0.00
0.00 + -0.04x + x2 = 0 + 0.64
-0.04x + x2 = 0 + 0.64

Combine like terms: 0 + 0.64 = 0.64
-0.04x + x2 = 0.64

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-0.04x + 0.25 + x2 = 0.64 + 0.25

Reorder the terms:
0.25 + -0.04x + x2 = 0.64 + 0.25

Combine like terms: 0.64 + 0.25 = 0.89
0.25 + -0.04x + x2 = 0.89

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.89

Calculate the square root of the right side: 0.943398113

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.943398113 and -0.943398113.

Subproblem 1

x + 0.5 = 0.943398113 Simplifying x + 0.5 = 0.943398113 Reorder the terms: 0.5 + x = 0.943398113 Solving 0.5 + x = 0.943398113 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.943398113 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.943398113 + -0.5 x = 0.943398113 + -0.5 Combine like terms: 0.943398113 + -0.5 = 0.443398113 x = 0.443398113 Simplifying x = 0.443398113

Subproblem 2

x + 0.5 = -0.943398113 Simplifying x + 0.5 = -0.943398113 Reorder the terms: 0.5 + x = -0.943398113 Solving 0.5 + x = -0.943398113 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.943398113 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.943398113 + -0.5 x = -0.943398113 + -0.5 Combine like terms: -0.943398113 + -0.5 = -1.443398113 x = -1.443398113 Simplifying x = -1.443398113

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.443398113, -1.443398113}

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