7x^2-174x-9=0

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Solution for 7x^2-174x-9=0 equation:


Simplifying
7x2 + -174x + -9 = 0

Reorder the terms:
-9 + -174x + 7x2 = 0

Solving
-9 + -174x + 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'.
-1.285714286 + -24.85714286x + x2 = 0

Move the constant term to the right:

Add '1.285714286' to each side of the equation.
-1.285714286 + -24.85714286x + 1.285714286 + x2 = 0 + 1.285714286

Reorder the terms:
-1.285714286 + 1.285714286 + -24.85714286x + x2 = 0 + 1.285714286

Combine like terms: -1.285714286 + 1.285714286 = 0.000000000
0.000000000 + -24.85714286x + x2 = 0 + 1.285714286
-24.85714286x + x2 = 0 + 1.285714286

Combine like terms: 0 + 1.285714286 = 1.285714286
-24.85714286x + x2 = 1.285714286

The x term is -24.85714286x.  Take half its coefficient (-12.42857143).
Square it (154.4693878) and add it to both sides.

Add '154.4693878' to each side of the equation.
-24.85714286x + 154.4693878 + x2 = 1.285714286 + 154.4693878

Reorder the terms:
154.4693878 + -24.85714286x + x2 = 1.285714286 + 154.4693878

Combine like terms: 1.285714286 + 154.4693878 = 155.755102086
154.4693878 + -24.85714286x + x2 = 155.755102086

Factor a perfect square on the left side:
(x + -12.42857143)(x + -12.42857143) = 155.755102086

Calculate the square root of the right side: 12.480188383

Break this problem into two subproblems by setting 
(x + -12.42857143) equal to 12.480188383 and -12.480188383.

Subproblem 1

x + -12.42857143 = 12.480188383 Simplifying x + -12.42857143 = 12.480188383 Reorder the terms: -12.42857143 + x = 12.480188383 Solving -12.42857143 + x = 12.480188383 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12.42857143' to each side of the equation. -12.42857143 + 12.42857143 + x = 12.480188383 + 12.42857143 Combine like terms: -12.42857143 + 12.42857143 = 0.00000000 0.00000000 + x = 12.480188383 + 12.42857143 x = 12.480188383 + 12.42857143 Combine like terms: 12.480188383 + 12.42857143 = 24.908759813 x = 24.908759813 Simplifying x = 24.908759813

Subproblem 2

x + -12.42857143 = -12.480188383 Simplifying x + -12.42857143 = -12.480188383 Reorder the terms: -12.42857143 + x = -12.480188383 Solving -12.42857143 + x = -12.480188383 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12.42857143' to each side of the equation. -12.42857143 + 12.42857143 + x = -12.480188383 + 12.42857143 Combine like terms: -12.42857143 + 12.42857143 = 0.00000000 0.00000000 + x = -12.480188383 + 12.42857143 x = -12.480188383 + 12.42857143 Combine like terms: -12.480188383 + 12.42857143 = -0.051616953 x = -0.051616953 Simplifying x = -0.051616953

Solution

The solution to the problem is based on the solutions from the subproblems. x = {24.908759813, -0.051616953}

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