7x(-8+2x)=4-(3x-12)

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Solution for 7x(-8+2x)=4-(3x-12) equation:


Simplifying
7x(-8 + 2x) = 4 + -1(3x + -12)
(-8 * 7x + 2x * 7x) = 4 + -1(3x + -12)
(-56x + 14x2) = 4 + -1(3x + -12)

Reorder the terms:
-56x + 14x2 = 4 + -1(-12 + 3x)
-56x + 14x2 = 4 + (-12 * -1 + 3x * -1)
-56x + 14x2 = 4 + (12 + -3x)

Combine like terms: 4 + 12 = 16
-56x + 14x2 = 16 + -3x

Solving
-56x + 14x2 = 16 + -3x

Solving for variable 'x'.

Reorder the terms:
-16 + -56x + 3x + 14x2 = 16 + -3x + -16 + 3x

Combine like terms: -56x + 3x = -53x
-16 + -53x + 14x2 = 16 + -3x + -16 + 3x

Reorder the terms:
-16 + -53x + 14x2 = 16 + -16 + -3x + 3x

Combine like terms: 16 + -16 = 0
-16 + -53x + 14x2 = 0 + -3x + 3x
-16 + -53x + 14x2 = -3x + 3x

Combine like terms: -3x + 3x = 0
-16 + -53x + 14x2 = 0

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

Divide each side by '14'.
-1.142857143 + -3.785714286x + x2 = 0

Move the constant term to the right:

Add '1.142857143' to each side of the equation.
-1.142857143 + -3.785714286x + 1.142857143 + x2 = 0 + 1.142857143

Reorder the terms:
-1.142857143 + 1.142857143 + -3.785714286x + x2 = 0 + 1.142857143

Combine like terms: -1.142857143 + 1.142857143 = 0.000000000
0.000000000 + -3.785714286x + x2 = 0 + 1.142857143
-3.785714286x + x2 = 0 + 1.142857143

Combine like terms: 0 + 1.142857143 = 1.142857143
-3.785714286x + x2 = 1.142857143

The x term is -3.785714286x.  Take half its coefficient (-1.892857143).
Square it (3.582908164) and add it to both sides.

Add '3.582908164' to each side of the equation.
-3.785714286x + 3.582908164 + x2 = 1.142857143 + 3.582908164

Reorder the terms:
3.582908164 + -3.785714286x + x2 = 1.142857143 + 3.582908164

Combine like terms: 1.142857143 + 3.582908164 = 4.725765307
3.582908164 + -3.785714286x + x2 = 4.725765307

Factor a perfect square on the left side:
(x + -1.892857143)(x + -1.892857143) = 4.725765307

Calculate the square root of the right side: 2.173882542

Break this problem into two subproblems by setting 
(x + -1.892857143) equal to 2.173882542 and -2.173882542.

Subproblem 1

x + -1.892857143 = 2.173882542 Simplifying x + -1.892857143 = 2.173882542 Reorder the terms: -1.892857143 + x = 2.173882542 Solving -1.892857143 + x = 2.173882542 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.892857143' to each side of the equation. -1.892857143 + 1.892857143 + x = 2.173882542 + 1.892857143 Combine like terms: -1.892857143 + 1.892857143 = 0.000000000 0.000000000 + x = 2.173882542 + 1.892857143 x = 2.173882542 + 1.892857143 Combine like terms: 2.173882542 + 1.892857143 = 4.066739685 x = 4.066739685 Simplifying x = 4.066739685

Subproblem 2

x + -1.892857143 = -2.173882542 Simplifying x + -1.892857143 = -2.173882542 Reorder the terms: -1.892857143 + x = -2.173882542 Solving -1.892857143 + x = -2.173882542 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.892857143' to each side of the equation. -1.892857143 + 1.892857143 + x = -2.173882542 + 1.892857143 Combine like terms: -1.892857143 + 1.892857143 = 0.000000000 0.000000000 + x = -2.173882542 + 1.892857143 x = -2.173882542 + 1.892857143 Combine like terms: -2.173882542 + 1.892857143 = -0.281025399 x = -0.281025399 Simplifying x = -0.281025399

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.066739685, -0.281025399}

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