2x(4x-4)=30-5x

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Solution for 2x(4x-4)=30-5x equation:


Simplifying
2x(4x + -4) = 30 + -5x

Reorder the terms:
2x(-4 + 4x) = 30 + -5x
(-4 * 2x + 4x * 2x) = 30 + -5x
(-8x + 8x2) = 30 + -5x

Solving
-8x + 8x2 = 30 + -5x

Solving for variable 'x'.

Reorder the terms:
-30 + -8x + 5x + 8x2 = 30 + -5x + -30 + 5x

Combine like terms: -8x + 5x = -3x
-30 + -3x + 8x2 = 30 + -5x + -30 + 5x

Reorder the terms:
-30 + -3x + 8x2 = 30 + -30 + -5x + 5x

Combine like terms: 30 + -30 = 0
-30 + -3x + 8x2 = 0 + -5x + 5x
-30 + -3x + 8x2 = -5x + 5x

Combine like terms: -5x + 5x = 0
-30 + -3x + 8x2 = 0

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

Divide each side by '8'.
-3.75 + -0.375x + x2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + -0.375x + 3.75 + x2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + -0.375x + x2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + -0.375x + x2 = 0 + 3.75
-0.375x + x2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
-0.375x + x2 = 3.75

The x term is -0.375x.  Take half its coefficient (-0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
-0.375x + 0.03515625 + x2 = 3.75 + 0.03515625

Reorder the terms:
0.03515625 + -0.375x + x2 = 3.75 + 0.03515625

Combine like terms: 3.75 + 0.03515625 = 3.78515625
0.03515625 + -0.375x + x2 = 3.78515625

Factor a perfect square on the left side:
(x + -0.1875)(x + -0.1875) = 3.78515625

Calculate the square root of the right side: 1.945547802

Break this problem into two subproblems by setting 
(x + -0.1875) equal to 1.945547802 and -1.945547802.

Subproblem 1

x + -0.1875 = 1.945547802 Simplifying x + -0.1875 = 1.945547802 Reorder the terms: -0.1875 + x = 1.945547802 Solving -0.1875 + x = 1.945547802 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + x = 1.945547802 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + x = 1.945547802 + 0.1875 x = 1.945547802 + 0.1875 Combine like terms: 1.945547802 + 0.1875 = 2.133047802 x = 2.133047802 Simplifying x = 2.133047802

Subproblem 2

x + -0.1875 = -1.945547802 Simplifying x + -0.1875 = -1.945547802 Reorder the terms: -0.1875 + x = -1.945547802 Solving -0.1875 + x = -1.945547802 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1875' to each side of the equation. -0.1875 + 0.1875 + x = -1.945547802 + 0.1875 Combine like terms: -0.1875 + 0.1875 = 0.0000 0.0000 + x = -1.945547802 + 0.1875 x = -1.945547802 + 0.1875 Combine like terms: -1.945547802 + 0.1875 = -1.758047802 x = -1.758047802 Simplifying x = -1.758047802

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.133047802, -1.758047802}

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