3x-2x(20-x)=35

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Solution for 3x-2x(20-x)=35 equation:


Simplifying
3x + -2x(20 + -1x) = 35
3x + (20 * -2x + -1x * -2x) = 35
3x + (-40x + 2x2) = 35

Combine like terms: 3x + -40x = -37x
-37x + 2x2 = 35

Solving
-37x + 2x2 = 35

Solving for variable 'x'.

Reorder the terms:
-35 + -37x + 2x2 = 35 + -35

Combine like terms: 35 + -35 = 0
-35 + -37x + 2x2 = 0

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

Divide each side by '2'.
-17.5 + -18.5x + x2 = 0

Move the constant term to the right:

Add '17.5' to each side of the equation.
-17.5 + -18.5x + 17.5 + x2 = 0 + 17.5

Reorder the terms:
-17.5 + 17.5 + -18.5x + x2 = 0 + 17.5

Combine like terms: -17.5 + 17.5 = 0.0
0.0 + -18.5x + x2 = 0 + 17.5
-18.5x + x2 = 0 + 17.5

Combine like terms: 0 + 17.5 = 17.5
-18.5x + x2 = 17.5

The x term is -18.5x.  Take half its coefficient (-9.25).
Square it (85.5625) and add it to both sides.

Add '85.5625' to each side of the equation.
-18.5x + 85.5625 + x2 = 17.5 + 85.5625

Reorder the terms:
85.5625 + -18.5x + x2 = 17.5 + 85.5625

Combine like terms: 17.5 + 85.5625 = 103.0625
85.5625 + -18.5x + x2 = 103.0625

Factor a perfect square on the left side:
(x + -9.25)(x + -9.25) = 103.0625

Calculate the square root of the right side: 10.151970252

Break this problem into two subproblems by setting 
(x + -9.25) equal to 10.151970252 and -10.151970252.

Subproblem 1

x + -9.25 = 10.151970252 Simplifying x + -9.25 = 10.151970252 Reorder the terms: -9.25 + x = 10.151970252 Solving -9.25 + x = 10.151970252 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.25' to each side of the equation. -9.25 + 9.25 + x = 10.151970252 + 9.25 Combine like terms: -9.25 + 9.25 = 0.00 0.00 + x = 10.151970252 + 9.25 x = 10.151970252 + 9.25 Combine like terms: 10.151970252 + 9.25 = 19.401970252 x = 19.401970252 Simplifying x = 19.401970252

Subproblem 2

x + -9.25 = -10.151970252 Simplifying x + -9.25 = -10.151970252 Reorder the terms: -9.25 + x = -10.151970252 Solving -9.25 + x = -10.151970252 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.25' to each side of the equation. -9.25 + 9.25 + x = -10.151970252 + 9.25 Combine like terms: -9.25 + 9.25 = 0.00 0.00 + x = -10.151970252 + 9.25 x = -10.151970252 + 9.25 Combine like terms: -10.151970252 + 9.25 = -0.901970252 x = -0.901970252 Simplifying x = -0.901970252

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.401970252, -0.901970252}

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