0.9*x*(x-350)=20

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Solution for 0.9*x*(x-350)=20 equation:


Simplifying
0.9x(x + -350) = 20

Reorder the terms:
0.9x(-350 + x) = 20
(-350 * 0.9x + x * 0.9x) = 20
(-315x + 0.9x2) = 20

Solving
-315x + 0.9x2 = 20

Solving for variable 'x'.

Reorder the terms:
-20 + -315x + 0.9x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + -315x + 0.9x2 = 0

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

Divide each side by '0.9'.
-22.22222222 + -350x + x2 = 0

Move the constant term to the right:

Add '22.22222222' to each side of the equation.
-22.22222222 + -350x + 22.22222222 + x2 = 0 + 22.22222222

Reorder the terms:
-22.22222222 + 22.22222222 + -350x + x2 = 0 + 22.22222222

Combine like terms: -22.22222222 + 22.22222222 = 0.00000000
0.00000000 + -350x + x2 = 0 + 22.22222222
-350x + x2 = 0 + 22.22222222

Combine like terms: 0 + 22.22222222 = 22.22222222
-350x + x2 = 22.22222222

The x term is -350x.  Take half its coefficient (-175).
Square it (30625) and add it to both sides.

Add '30625' to each side of the equation.
-350x + 30625 + x2 = 22.22222222 + 30625

Reorder the terms:
30625 + -350x + x2 = 22.22222222 + 30625

Combine like terms: 22.22222222 + 30625 = 30647.22222222
30625 + -350x + x2 = 30647.22222222

Factor a perfect square on the left side:
(x + -175)(x + -175) = 30647.22222222

Calculate the square root of the right side: 175.06348055

Break this problem into two subproblems by setting 
(x + -175) equal to 175.06348055 and -175.06348055.

Subproblem 1

x + -175 = 175.06348055 Simplifying x + -175 = 175.06348055 Reorder the terms: -175 + x = 175.06348055 Solving -175 + x = 175.06348055 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '175' to each side of the equation. -175 + 175 + x = 175.06348055 + 175 Combine like terms: -175 + 175 = 0 0 + x = 175.06348055 + 175 x = 175.06348055 + 175 Combine like terms: 175.06348055 + 175 = 350.06348055 x = 350.06348055 Simplifying x = 350.06348055

Subproblem 2

x + -175 = -175.06348055 Simplifying x + -175 = -175.06348055 Reorder the terms: -175 + x = -175.06348055 Solving -175 + x = -175.06348055 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '175' to each side of the equation. -175 + 175 + x = -175.06348055 + 175 Combine like terms: -175 + 175 = 0 0 + x = -175.06348055 + 175 x = -175.06348055 + 175 Combine like terms: -175.06348055 + 175 = -0.06348055 x = -0.06348055 Simplifying x = -0.06348055

Solution

The solution to the problem is based on the solutions from the subproblems. x = {350.06348055, -0.06348055}

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