(4x-2)*(4x-2)-40x-20+21=0

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Solution for (4x-2)*(4x-2)-40x-20+21=0 equation:


Simplifying
(4x + -2)(4x + -2) + -40x + -20 + 21 = 0

Reorder the terms:
(-2 + 4x)(4x + -2) + -40x + -20 + 21 = 0

Reorder the terms:
(-2 + 4x)(-2 + 4x) + -40x + -20 + 21 = 0

Multiply (-2 + 4x) * (-2 + 4x)
(-2(-2 + 4x) + 4x * (-2 + 4x)) + -40x + -20 + 21 = 0
((-2 * -2 + 4x * -2) + 4x * (-2 + 4x)) + -40x + -20 + 21 = 0
((4 + -8x) + 4x * (-2 + 4x)) + -40x + -20 + 21 = 0
(4 + -8x + (-2 * 4x + 4x * 4x)) + -40x + -20 + 21 = 0
(4 + -8x + (-8x + 16x2)) + -40x + -20 + 21 = 0

Combine like terms: -8x + -8x = -16x
(4 + -16x + 16x2) + -40x + -20 + 21 = 0

Reorder the terms:
4 + -20 + 21 + -16x + -40x + 16x2 = 0

Combine like terms: 4 + -20 = -16
-16 + 21 + -16x + -40x + 16x2 = 0

Combine like terms: -16 + 21 = 5
5 + -16x + -40x + 16x2 = 0

Combine like terms: -16x + -40x = -56x
5 + -56x + 16x2 = 0

Solving
5 + -56x + 16x2 = 0

Solving for variable 'x'.

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

Divide each side by '16'.
0.3125 + -3.5x + x2 = 0

Move the constant term to the right:

Add '-0.3125' to each side of the equation.
0.3125 + -3.5x + -0.3125 + x2 = 0 + -0.3125

Reorder the terms:
0.3125 + -0.3125 + -3.5x + x2 = 0 + -0.3125

Combine like terms: 0.3125 + -0.3125 = 0.0000
0.0000 + -3.5x + x2 = 0 + -0.3125
-3.5x + x2 = 0 + -0.3125

Combine like terms: 0 + -0.3125 = -0.3125
-3.5x + x2 = -0.3125

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = -0.3125 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = -0.3125 + 3.0625

Combine like terms: -0.3125 + 3.0625 = 2.75
3.0625 + -3.5x + x2 = 2.75

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 2.75

Calculate the square root of the right side: 1.658312395

Break this problem into two subproblems by setting 
(x + -1.75) equal to 1.658312395 and -1.658312395.

Subproblem 1

x + -1.75 = 1.658312395 Simplifying x + -1.75 = 1.658312395 Reorder the terms: -1.75 + x = 1.658312395 Solving -1.75 + x = 1.658312395 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 1.658312395 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 1.658312395 + 1.75 x = 1.658312395 + 1.75 Combine like terms: 1.658312395 + 1.75 = 3.408312395 x = 3.408312395 Simplifying x = 3.408312395

Subproblem 2

x + -1.75 = -1.658312395 Simplifying x + -1.75 = -1.658312395 Reorder the terms: -1.75 + x = -1.658312395 Solving -1.75 + x = -1.658312395 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -1.658312395 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -1.658312395 + 1.75 x = -1.658312395 + 1.75 Combine like terms: -1.658312395 + 1.75 = 0.091687605 x = 0.091687605 Simplifying x = 0.091687605

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.408312395, 0.091687605}

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