4x(x-5)-5=6x+7.4-4x

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Solution for 4x(x-5)-5=6x+7.4-4x equation:


Simplifying
4x(x + -5) + -5 = 6x + 7.4 + -4x

Reorder the terms:
4x(-5 + x) + -5 = 6x + 7.4 + -4x
(-5 * 4x + x * 4x) + -5 = 6x + 7.4 + -4x
(-20x + 4x2) + -5 = 6x + 7.4 + -4x

Reorder the terms:
-5 + -20x + 4x2 = 6x + 7.4 + -4x

Reorder the terms:
-5 + -20x + 4x2 = 7.4 + 6x + -4x

Combine like terms: 6x + -4x = 2x
-5 + -20x + 4x2 = 7.4 + 2x

Solving
-5 + -20x + 4x2 = 7.4 + 2x

Solving for variable 'x'.

Reorder the terms:
-5 + -7.4 + -20x + -2x + 4x2 = 7.4 + 2x + -7.4 + -2x

Combine like terms: -5 + -7.4 = -12.4
-12.4 + -20x + -2x + 4x2 = 7.4 + 2x + -7.4 + -2x

Combine like terms: -20x + -2x = -22x
-12.4 + -22x + 4x2 = 7.4 + 2x + -7.4 + -2x

Reorder the terms:
-12.4 + -22x + 4x2 = 7.4 + -7.4 + 2x + -2x

Combine like terms: 7.4 + -7.4 = 0.0
-12.4 + -22x + 4x2 = 0.0 + 2x + -2x
-12.4 + -22x + 4x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-12.4 + -22x + 4x2 = 0

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

Divide each side by '4'.
-3.1 + -5.5x + x2 = 0

Move the constant term to the right:

Add '3.1' to each side of the equation.
-3.1 + -5.5x + 3.1 + x2 = 0 + 3.1

Reorder the terms:
-3.1 + 3.1 + -5.5x + x2 = 0 + 3.1

Combine like terms: -3.1 + 3.1 = 0.0
0.0 + -5.5x + x2 = 0 + 3.1
-5.5x + x2 = 0 + 3.1

Combine like terms: 0 + 3.1 = 3.1
-5.5x + x2 = 3.1

The x term is -5.5x.  Take half its coefficient (-2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
-5.5x + 7.5625 + x2 = 3.1 + 7.5625

Reorder the terms:
7.5625 + -5.5x + x2 = 3.1 + 7.5625

Combine like terms: 3.1 + 7.5625 = 10.6625
7.5625 + -5.5x + x2 = 10.6625

Factor a perfect square on the left side:
(x + -2.75)(x + -2.75) = 10.6625

Calculate the square root of the right side: 3.265348373

Break this problem into two subproblems by setting 
(x + -2.75) equal to 3.265348373 and -3.265348373.

Subproblem 1

x + -2.75 = 3.265348373 Simplifying x + -2.75 = 3.265348373 Reorder the terms: -2.75 + x = 3.265348373 Solving -2.75 + x = 3.265348373 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = 3.265348373 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = 3.265348373 + 2.75 x = 3.265348373 + 2.75 Combine like terms: 3.265348373 + 2.75 = 6.015348373 x = 6.015348373 Simplifying x = 6.015348373

Subproblem 2

x + -2.75 = -3.265348373 Simplifying x + -2.75 = -3.265348373 Reorder the terms: -2.75 + x = -3.265348373 Solving -2.75 + x = -3.265348373 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = -3.265348373 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = -3.265348373 + 2.75 x = -3.265348373 + 2.75 Combine like terms: -3.265348373 + 2.75 = -0.515348373 x = -0.515348373 Simplifying x = -0.515348373

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.015348373, -0.515348373}

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