.16x^2-9x-4000=0

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Solution for .16x^2-9x-4000=0 equation:


Simplifying
0.16x2 + -9x + -4000 = 0

Reorder the terms:
-4000 + -9x + 0.16x2 = 0

Solving
-4000 + -9x + 0.16x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.16'.
-25000 + -56.25x + x2 = 0

Move the constant term to the right:

Add '25000' to each side of the equation.
-25000 + -56.25x + 25000 + x2 = 0 + 25000

Reorder the terms:
-25000 + 25000 + -56.25x + x2 = 0 + 25000

Combine like terms: -25000 + 25000 = 0
0 + -56.25x + x2 = 0 + 25000
-56.25x + x2 = 0 + 25000

Combine like terms: 0 + 25000 = 25000
-56.25x + x2 = 25000

The x term is -56.25x.  Take half its coefficient (-28.125).
Square it (791.015625) and add it to both sides.

Add '791.015625' to each side of the equation.
-56.25x + 791.015625 + x2 = 25000 + 791.015625

Reorder the terms:
791.015625 + -56.25x + x2 = 25000 + 791.015625

Combine like terms: 25000 + 791.015625 = 25791.015625
791.015625 + -56.25x + x2 = 25791.015625

Factor a perfect square on the left side:
(x + -28.125)(x + -28.125) = 25791.015625

Calculate the square root of the right side: 160.595814469

Break this problem into two subproblems by setting 
(x + -28.125) equal to 160.595814469 and -160.595814469.

Subproblem 1

x + -28.125 = 160.595814469 Simplifying x + -28.125 = 160.595814469 Reorder the terms: -28.125 + x = 160.595814469 Solving -28.125 + x = 160.595814469 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28.125' to each side of the equation. -28.125 + 28.125 + x = 160.595814469 + 28.125 Combine like terms: -28.125 + 28.125 = 0.000 0.000 + x = 160.595814469 + 28.125 x = 160.595814469 + 28.125 Combine like terms: 160.595814469 + 28.125 = 188.720814469 x = 188.720814469 Simplifying x = 188.720814469

Subproblem 2

x + -28.125 = -160.595814469 Simplifying x + -28.125 = -160.595814469 Reorder the terms: -28.125 + x = -160.595814469 Solving -28.125 + x = -160.595814469 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28.125' to each side of the equation. -28.125 + 28.125 + x = -160.595814469 + 28.125 Combine like terms: -28.125 + 28.125 = 0.000 0.000 + x = -160.595814469 + 28.125 x = -160.595814469 + 28.125 Combine like terms: -160.595814469 + 28.125 = -132.470814469 x = -132.470814469 Simplifying x = -132.470814469

Solution

The solution to the problem is based on the solutions from the subproblems. x = {188.720814469, -132.470814469}

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