x+8(12-x)=7x(5x-42)

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Solution for x+8(12-x)=7x(5x-42) equation:


Simplifying
x + 8(12 + -1x) = 7x(5x + -42)
x + (12 * 8 + -1x * 8) = 7x(5x + -42)
x + (96 + -8x) = 7x(5x + -42)

Reorder the terms:
96 + x + -8x = 7x(5x + -42)

Combine like terms: x + -8x = -7x
96 + -7x = 7x(5x + -42)

Reorder the terms:
96 + -7x = 7x(-42 + 5x)
96 + -7x = (-42 * 7x + 5x * 7x)
96 + -7x = (-294x + 35x2)

Solving
96 + -7x = -294x + 35x2

Solving for variable 'x'.

Combine like terms: -7x + 294x = 287x
96 + 287x + -35x2 = -294x + 35x2 + 294x + -35x2

Reorder the terms:
96 + 287x + -35x2 = -294x + 294x + 35x2 + -35x2

Combine like terms: -294x + 294x = 0
96 + 287x + -35x2 = 0 + 35x2 + -35x2
96 + 287x + -35x2 = 35x2 + -35x2

Combine like terms: 35x2 + -35x2 = 0
96 + 287x + -35x2 = 0

Begin completing the square.  Divide all terms by
-35 the coefficient of the squared term: 

Divide each side by '-35'.
-2.742857143 + -8.2x + x2 = 0

Move the constant term to the right:

Add '2.742857143' to each side of the equation.
-2.742857143 + -8.2x + 2.742857143 + x2 = 0 + 2.742857143

Reorder the terms:
-2.742857143 + 2.742857143 + -8.2x + x2 = 0 + 2.742857143

Combine like terms: -2.742857143 + 2.742857143 = 0.000000000
0.000000000 + -8.2x + x2 = 0 + 2.742857143
-8.2x + x2 = 0 + 2.742857143

Combine like terms: 0 + 2.742857143 = 2.742857143
-8.2x + x2 = 2.742857143

The x term is -8.2x.  Take half its coefficient (-4.1).
Square it (16.81) and add it to both sides.

Add '16.81' to each side of the equation.
-8.2x + 16.81 + x2 = 2.742857143 + 16.81

Reorder the terms:
16.81 + -8.2x + x2 = 2.742857143 + 16.81

Combine like terms: 2.742857143 + 16.81 = 19.552857143
16.81 + -8.2x + x2 = 19.552857143

Factor a perfect square on the left side:
(x + -4.1)(x + -4.1) = 19.552857143

Calculate the square root of the right side: 4.421861276

Break this problem into two subproblems by setting 
(x + -4.1) equal to 4.421861276 and -4.421861276.

Subproblem 1

x + -4.1 = 4.421861276 Simplifying x + -4.1 = 4.421861276 Reorder the terms: -4.1 + x = 4.421861276 Solving -4.1 + x = 4.421861276 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.1' to each side of the equation. -4.1 + 4.1 + x = 4.421861276 + 4.1 Combine like terms: -4.1 + 4.1 = 0.0 0.0 + x = 4.421861276 + 4.1 x = 4.421861276 + 4.1 Combine like terms: 4.421861276 + 4.1 = 8.521861276 x = 8.521861276 Simplifying x = 8.521861276

Subproblem 2

x + -4.1 = -4.421861276 Simplifying x + -4.1 = -4.421861276 Reorder the terms: -4.1 + x = -4.421861276 Solving -4.1 + x = -4.421861276 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.1' to each side of the equation. -4.1 + 4.1 + x = -4.421861276 + 4.1 Combine like terms: -4.1 + 4.1 = 0.0 0.0 + x = -4.421861276 + 4.1 x = -4.421861276 + 4.1 Combine like terms: -4.421861276 + 4.1 = -0.321861276 x = -0.321861276 Simplifying x = -0.321861276

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.521861276, -0.321861276}

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