20x-x^2=25

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Solution for 20x-x^2=25 equation:


Simplifying
20x + -1x2 = 25

Solving
20x + -1x2 = 25

Solving for variable 'x'.

Reorder the terms:
-25 + 20x + -1x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + 20x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
25 + -20x + x2 = 0

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + -20x + -25 + x2 = 0 + -25

Reorder the terms:
25 + -25 + -20x + x2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + -20x + x2 = 0 + -25
-20x + x2 = 0 + -25

Combine like terms: 0 + -25 = -25
-20x + x2 = -25

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = -25 + 100

Reorder the terms:
100 + -20x + x2 = -25 + 100

Combine like terms: -25 + 100 = 75
100 + -20x + x2 = 75

Factor a perfect square on the left side:
(x + -10)(x + -10) = 75

Calculate the square root of the right side: 8.660254038

Break this problem into two subproblems by setting 
(x + -10) equal to 8.660254038 and -8.660254038.

Subproblem 1

x + -10 = 8.660254038 Simplifying x + -10 = 8.660254038 Reorder the terms: -10 + x = 8.660254038 Solving -10 + x = 8.660254038 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 8.660254038 + 10 Combine like terms: -10 + 10 = 0 0 + x = 8.660254038 + 10 x = 8.660254038 + 10 Combine like terms: 8.660254038 + 10 = 18.660254038 x = 18.660254038 Simplifying x = 18.660254038

Subproblem 2

x + -10 = -8.660254038 Simplifying x + -10 = -8.660254038 Reorder the terms: -10 + x = -8.660254038 Solving -10 + x = -8.660254038 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -8.660254038 + 10 Combine like terms: -10 + 10 = 0 0 + x = -8.660254038 + 10 x = -8.660254038 + 10 Combine like terms: -8.660254038 + 10 = 1.339745962 x = 1.339745962 Simplifying x = 1.339745962

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.660254038, 1.339745962}

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