400-.1x-.6x^2=0

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Solution for 400-.1x-.6x^2=0 equation:


Simplifying
400 + -0.1x + -0.6x2 = 0

Solving
400 + -0.1x + -0.6x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.6 the coefficient of the squared term: 

Divide each side by '-0.6'.
-666.6666667 + 0.1666666667x + x2 = 0

Move the constant term to the right:

Add '666.6666667' to each side of the equation.
-666.6666667 + 0.1666666667x + 666.6666667 + x2 = 0 + 666.6666667

Reorder the terms:
-666.6666667 + 666.6666667 + 0.1666666667x + x2 = 0 + 666.6666667

Combine like terms: -666.6666667 + 666.6666667 = 0.0000000
0.0000000 + 0.1666666667x + x2 = 0 + 666.6666667
0.1666666667x + x2 = 0 + 666.6666667

Combine like terms: 0 + 666.6666667 = 666.6666667
0.1666666667x + x2 = 666.6666667

The x term is 0.1666666667x.  Take half its coefficient (0.08333333335).
Square it (0.006944444447) and add it to both sides.

Add '0.006944444447' to each side of the equation.
0.1666666667x + 0.006944444447 + x2 = 666.6666667 + 0.006944444447

Reorder the terms:
0.006944444447 + 0.1666666667x + x2 = 666.6666667 + 0.006944444447

Combine like terms: 666.6666667 + 0.006944444447 = 666.673611144447
0.006944444447 + 0.1666666667x + x2 = 666.673611144447

Factor a perfect square on the left side:
(x + 0.08333333335)(x + 0.08333333335) = 666.673611144447

Calculate the square root of the right side: 25.820023454

Break this problem into two subproblems by setting 
(x + 0.08333333335) equal to 25.820023454 and -25.820023454.

Subproblem 1

x + 0.08333333335 = 25.820023454 Simplifying x + 0.08333333335 = 25.820023454 Reorder the terms: 0.08333333335 + x = 25.820023454 Solving 0.08333333335 + x = 25.820023454 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.08333333335' to each side of the equation. 0.08333333335 + -0.08333333335 + x = 25.820023454 + -0.08333333335 Combine like terms: 0.08333333335 + -0.08333333335 = 0.00000000000 0.00000000000 + x = 25.820023454 + -0.08333333335 x = 25.820023454 + -0.08333333335 Combine like terms: 25.820023454 + -0.08333333335 = 25.73669012065 x = 25.73669012065 Simplifying x = 25.73669012065

Subproblem 2

x + 0.08333333335 = -25.820023454 Simplifying x + 0.08333333335 = -25.820023454 Reorder the terms: 0.08333333335 + x = -25.820023454 Solving 0.08333333335 + x = -25.820023454 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.08333333335' to each side of the equation. 0.08333333335 + -0.08333333335 + x = -25.820023454 + -0.08333333335 Combine like terms: 0.08333333335 + -0.08333333335 = 0.00000000000 0.00000000000 + x = -25.820023454 + -0.08333333335 x = -25.820023454 + -0.08333333335 Combine like terms: -25.820023454 + -0.08333333335 = -25.90335678735 x = -25.90335678735 Simplifying x = -25.90335678735

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.73669012065, -25.90335678735}

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