9x^2-40x-35=0

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Solution for 9x^2-40x-35=0 equation:


Simplifying
9x2 + -40x + -35 = 0

Reorder the terms:
-35 + -40x + 9x2 = 0

Solving
-35 + -40x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-3.888888889 + -4.444444444x + x2 = 0

Move the constant term to the right:

Add '3.888888889' to each side of the equation.
-3.888888889 + -4.444444444x + 3.888888889 + x2 = 0 + 3.888888889

Reorder the terms:
-3.888888889 + 3.888888889 + -4.444444444x + x2 = 0 + 3.888888889

Combine like terms: -3.888888889 + 3.888888889 = 0.000000000
0.000000000 + -4.444444444x + x2 = 0 + 3.888888889
-4.444444444x + x2 = 0 + 3.888888889

Combine like terms: 0 + 3.888888889 = 3.888888889
-4.444444444x + x2 = 3.888888889

The x term is -4.444444444x.  Take half its coefficient (-2.222222222).
Square it (4.938271604) and add it to both sides.

Add '4.938271604' to each side of the equation.
-4.444444444x + 4.938271604 + x2 = 3.888888889 + 4.938271604

Reorder the terms:
4.938271604 + -4.444444444x + x2 = 3.888888889 + 4.938271604

Combine like terms: 3.888888889 + 4.938271604 = 8.827160493
4.938271604 + -4.444444444x + x2 = 8.827160493

Factor a perfect square on the left side:
(x + -2.222222222)(x + -2.222222222) = 8.827160493

Calculate the square root of the right side: 2.971053768

Break this problem into two subproblems by setting 
(x + -2.222222222) equal to 2.971053768 and -2.971053768.

Subproblem 1

x + -2.222222222 = 2.971053768 Simplifying x + -2.222222222 = 2.971053768 Reorder the terms: -2.222222222 + x = 2.971053768 Solving -2.222222222 + x = 2.971053768 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.222222222' to each side of the equation. -2.222222222 + 2.222222222 + x = 2.971053768 + 2.222222222 Combine like terms: -2.222222222 + 2.222222222 = 0.000000000 0.000000000 + x = 2.971053768 + 2.222222222 x = 2.971053768 + 2.222222222 Combine like terms: 2.971053768 + 2.222222222 = 5.19327599 x = 5.19327599 Simplifying x = 5.19327599

Subproblem 2

x + -2.222222222 = -2.971053768 Simplifying x + -2.222222222 = -2.971053768 Reorder the terms: -2.222222222 + x = -2.971053768 Solving -2.222222222 + x = -2.971053768 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.222222222' to each side of the equation. -2.222222222 + 2.222222222 + x = -2.971053768 + 2.222222222 Combine like terms: -2.222222222 + 2.222222222 = 0.000000000 0.000000000 + x = -2.971053768 + 2.222222222 x = -2.971053768 + 2.222222222 Combine like terms: -2.971053768 + 2.222222222 = -0.748831546 x = -0.748831546 Simplifying x = -0.748831546

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.19327599, -0.748831546}

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