20x-2x^2=12.5

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Solution for 20x-2x^2=12.5 equation:


Simplifying
20x + -2x2 = 12.5

Solving
20x + -2x2 = 12.5

Solving for variable 'x'.

Reorder the terms:
-12.5 + 20x + -2x2 = 12.5 + -12.5

Combine like terms: 12.5 + -12.5 = 0.0
-12.5 + 20x + -2x2 = 0.0

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

Divide each side by '-2'.
6.25 + -10x + x2 = 0.0

Move the constant term to the right:

Add '-6.25' to each side of the equation.
6.25 + -10x + -6.25 + x2 = 0.0 + -6.25

Reorder the terms:
6.25 + -6.25 + -10x + x2 = 0.0 + -6.25

Combine like terms: 6.25 + -6.25 = 0.00
0.00 + -10x + x2 = 0.0 + -6.25
-10x + x2 = 0.0 + -6.25

Combine like terms: 0.0 + -6.25 = -6.25
-10x + x2 = -6.25

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = -6.25 + 25

Reorder the terms:
25 + -10x + x2 = -6.25 + 25

Combine like terms: -6.25 + 25 = 18.75
25 + -10x + x2 = 18.75

Factor a perfect square on the left side:
(x + -5)(x + -5) = 18.75

Calculate the square root of the right side: 4.330127019

Break this problem into two subproblems by setting 
(x + -5) equal to 4.330127019 and -4.330127019.

Subproblem 1

x + -5 = 4.330127019 Simplifying x + -5 = 4.330127019 Reorder the terms: -5 + x = 4.330127019 Solving -5 + x = 4.330127019 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 4.330127019 + 5 Combine like terms: -5 + 5 = 0 0 + x = 4.330127019 + 5 x = 4.330127019 + 5 Combine like terms: 4.330127019 + 5 = 9.330127019 x = 9.330127019 Simplifying x = 9.330127019

Subproblem 2

x + -5 = -4.330127019 Simplifying x + -5 = -4.330127019 Reorder the terms: -5 + x = -4.330127019 Solving -5 + x = -4.330127019 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -4.330127019 + 5 Combine like terms: -5 + 5 = 0 0 + x = -4.330127019 + 5 x = -4.330127019 + 5 Combine like terms: -4.330127019 + 5 = 0.669872981 x = 0.669872981 Simplifying x = 0.669872981

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.330127019, 0.669872981}

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