(5x-4)(5x-4)=32

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Solution for (5x-4)(5x-4)=32 equation:


Simplifying
(5x + -4)(5x + -4) = 32

Reorder the terms:
(-4 + 5x)(5x + -4) = 32

Reorder the terms:
(-4 + 5x)(-4 + 5x) = 32

Multiply (-4 + 5x) * (-4 + 5x)
(-4(-4 + 5x) + 5x * (-4 + 5x)) = 32
((-4 * -4 + 5x * -4) + 5x * (-4 + 5x)) = 32
((16 + -20x) + 5x * (-4 + 5x)) = 32
(16 + -20x + (-4 * 5x + 5x * 5x)) = 32
(16 + -20x + (-20x + 25x2)) = 32

Combine like terms: -20x + -20x = -40x
(16 + -40x + 25x2) = 32

Solving
16 + -40x + 25x2 = 32

Solving for variable 'x'.

Reorder the terms:
16 + -32 + -40x + 25x2 = 32 + -32

Combine like terms: 16 + -32 = -16
-16 + -40x + 25x2 = 32 + -32

Combine like terms: 32 + -32 = 0
-16 + -40x + 25x2 = 0

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

Divide each side by '25'.
-0.64 + -1.6x + x2 = 0

Move the constant term to the right:

Add '0.64' to each side of the equation.
-0.64 + -1.6x + 0.64 + x2 = 0 + 0.64

Reorder the terms:
-0.64 + 0.64 + -1.6x + x2 = 0 + 0.64

Combine like terms: -0.64 + 0.64 = 0.00
0.00 + -1.6x + x2 = 0 + 0.64
-1.6x + x2 = 0 + 0.64

Combine like terms: 0 + 0.64 = 0.64
-1.6x + x2 = 0.64

The x term is -1.6x.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6x + 0.64 + x2 = 0.64 + 0.64

Reorder the terms:
0.64 + -1.6x + x2 = 0.64 + 0.64

Combine like terms: 0.64 + 0.64 = 1.28
0.64 + -1.6x + x2 = 1.28

Factor a perfect square on the left side:
(x + -0.8)(x + -0.8) = 1.28

Calculate the square root of the right side: 1.13137085

Break this problem into two subproblems by setting 
(x + -0.8) equal to 1.13137085 and -1.13137085.

Subproblem 1

x + -0.8 = 1.13137085 Simplifying x + -0.8 = 1.13137085 Reorder the terms: -0.8 + x = 1.13137085 Solving -0.8 + x = 1.13137085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = 1.13137085 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = 1.13137085 + 0.8 x = 1.13137085 + 0.8 Combine like terms: 1.13137085 + 0.8 = 1.93137085 x = 1.93137085 Simplifying x = 1.93137085

Subproblem 2

x + -0.8 = -1.13137085 Simplifying x + -0.8 = -1.13137085 Reorder the terms: -0.8 + x = -1.13137085 Solving -0.8 + x = -1.13137085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = -1.13137085 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = -1.13137085 + 0.8 x = -1.13137085 + 0.8 Combine like terms: -1.13137085 + 0.8 = -0.33137085 x = -0.33137085 Simplifying x = -0.33137085

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.93137085, -0.33137085}

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