4x(x+2)-6=2x-5

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Solution for 4x(x+2)-6=2x-5 equation:


Simplifying
4x(x + 2) + -6 = 2x + -5

Reorder the terms:
4x(2 + x) + -6 = 2x + -5
(2 * 4x + x * 4x) + -6 = 2x + -5
(8x + 4x2) + -6 = 2x + -5

Reorder the terms:
-6 + 8x + 4x2 = 2x + -5

Reorder the terms:
-6 + 8x + 4x2 = -5 + 2x

Solving
-6 + 8x + 4x2 = -5 + 2x

Solving for variable 'x'.

Reorder the terms:
-6 + 5 + 8x + -2x + 4x2 = -5 + 2x + 5 + -2x

Combine like terms: -6 + 5 = -1
-1 + 8x + -2x + 4x2 = -5 + 2x + 5 + -2x

Combine like terms: 8x + -2x = 6x
-1 + 6x + 4x2 = -5 + 2x + 5 + -2x

Reorder the terms:
-1 + 6x + 4x2 = -5 + 5 + 2x + -2x

Combine like terms: -5 + 5 = 0
-1 + 6x + 4x2 = 0 + 2x + -2x
-1 + 6x + 4x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-1 + 6x + 4x2 = 0

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

Divide each side by '4'.
-0.25 + 1.5x + x2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + 1.5x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + 1.5x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + 1.5x + x2 = 0 + 0.25
1.5x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
1.5x + x2 = 0.25

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 0.25 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 0.25 + 0.5625

Combine like terms: 0.25 + 0.5625 = 0.8125
0.5625 + 1.5x + x2 = 0.8125

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 0.8125

Calculate the square root of the right side: 0.901387819

Break this problem into two subproblems by setting 
(x + 0.75) equal to 0.901387819 and -0.901387819.

Subproblem 1

x + 0.75 = 0.901387819 Simplifying x + 0.75 = 0.901387819 Reorder the terms: 0.75 + x = 0.901387819 Solving 0.75 + x = 0.901387819 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 0.901387819 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 0.901387819 + -0.75 x = 0.901387819 + -0.75 Combine like terms: 0.901387819 + -0.75 = 0.151387819 x = 0.151387819 Simplifying x = 0.151387819

Subproblem 2

x + 0.75 = -0.901387819 Simplifying x + 0.75 = -0.901387819 Reorder the terms: 0.75 + x = -0.901387819 Solving 0.75 + x = -0.901387819 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -0.901387819 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -0.901387819 + -0.75 x = -0.901387819 + -0.75 Combine like terms: -0.901387819 + -0.75 = -1.651387819 x = -1.651387819 Simplifying x = -1.651387819

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.151387819, -1.651387819}

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