7x(x)-57x-108=0

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Solution for 7x(x)-57x-108=0 equation:


Simplifying
7x(x) + -57x + -108 = 0

Multiply x * x
7x2 + -57x + -108 = 0

Reorder the terms:
-108 + -57x + 7x2 = 0

Solving
-108 + -57x + 7x2 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
-15.42857143 + -8.142857143x + x2 = 0

Move the constant term to the right:

Add '15.42857143' to each side of the equation.
-15.42857143 + -8.142857143x + 15.42857143 + x2 = 0 + 15.42857143

Reorder the terms:
-15.42857143 + 15.42857143 + -8.142857143x + x2 = 0 + 15.42857143

Combine like terms: -15.42857143 + 15.42857143 = 0.00000000
0.00000000 + -8.142857143x + x2 = 0 + 15.42857143
-8.142857143x + x2 = 0 + 15.42857143

Combine like terms: 0 + 15.42857143 = 15.42857143
-8.142857143x + x2 = 15.42857143

The x term is -8.142857143x.  Take half its coefficient (-4.071428572).
Square it (16.57653062) and add it to both sides.

Add '16.57653062' to each side of the equation.
-8.142857143x + 16.57653062 + x2 = 15.42857143 + 16.57653062

Reorder the terms:
16.57653062 + -8.142857143x + x2 = 15.42857143 + 16.57653062

Combine like terms: 15.42857143 + 16.57653062 = 32.00510205
16.57653062 + -8.142857143x + x2 = 32.00510205

Factor a perfect square on the left side:
(x + -4.071428572)(x + -4.071428572) = 32.00510205

Calculate the square root of the right side: 5.657305193

Break this problem into two subproblems by setting 
(x + -4.071428572) equal to 5.657305193 and -5.657305193.

Subproblem 1

x + -4.071428572 = 5.657305193 Simplifying x + -4.071428572 = 5.657305193 Reorder the terms: -4.071428572 + x = 5.657305193 Solving -4.071428572 + x = 5.657305193 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.071428572' to each side of the equation. -4.071428572 + 4.071428572 + x = 5.657305193 + 4.071428572 Combine like terms: -4.071428572 + 4.071428572 = 0.000000000 0.000000000 + x = 5.657305193 + 4.071428572 x = 5.657305193 + 4.071428572 Combine like terms: 5.657305193 + 4.071428572 = 9.728733765 x = 9.728733765 Simplifying x = 9.728733765

Subproblem 2

x + -4.071428572 = -5.657305193 Simplifying x + -4.071428572 = -5.657305193 Reorder the terms: -4.071428572 + x = -5.657305193 Solving -4.071428572 + x = -5.657305193 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.071428572' to each side of the equation. -4.071428572 + 4.071428572 + x = -5.657305193 + 4.071428572 Combine like terms: -4.071428572 + 4.071428572 = 0.000000000 0.000000000 + x = -5.657305193 + 4.071428572 x = -5.657305193 + 4.071428572 Combine like terms: -5.657305193 + 4.071428572 = -1.585876621 x = -1.585876621 Simplifying x = -1.585876621

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.728733765, -1.585876621}

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