20x-x^2=0.75

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Solution for 20x-x^2=0.75 equation:


Simplifying
20x + -1x2 = 0.75

Solving
20x + -1x2 = 0.75

Solving for variable 'x'.

Reorder the terms:
-0.75 + 20x + -1x2 = 0.75 + -0.75

Combine like terms: 0.75 + -0.75 = 0.00
-0.75 + 20x + -1x2 = 0.00

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

Divide each side by '-1'.
0.75 + -20x + x2 = 0.00

Move the constant term to the right:

Add '-0.75' to each side of the equation.
0.75 + -20x + -0.75 + x2 = 0.00 + -0.75

Reorder the terms:
0.75 + -0.75 + -20x + x2 = 0.00 + -0.75

Combine like terms: 0.75 + -0.75 = 0.00
0.00 + -20x + x2 = 0.00 + -0.75
-20x + x2 = 0.00 + -0.75

Combine like terms: 0.00 + -0.75 = -0.75
-20x + x2 = -0.75

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 = -0.75 + 100

Reorder the terms:
100 + -20x + x2 = -0.75 + 100

Combine like terms: -0.75 + 100 = 99.25
100 + -20x + x2 = 99.25

Factor a perfect square on the left side:
(x + -10)(x + -10) = 99.25

Calculate the square root of the right side: 9.962429423

Break this problem into two subproblems by setting 
(x + -10) equal to 9.962429423 and -9.962429423.

Subproblem 1

x + -10 = 9.962429423 Simplifying x + -10 = 9.962429423 Reorder the terms: -10 + x = 9.962429423 Solving -10 + x = 9.962429423 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 = 9.962429423 + 10 Combine like terms: -10 + 10 = 0 0 + x = 9.962429423 + 10 x = 9.962429423 + 10 Combine like terms: 9.962429423 + 10 = 19.962429423 x = 19.962429423 Simplifying x = 19.962429423

Subproblem 2

x + -10 = -9.962429423 Simplifying x + -10 = -9.962429423 Reorder the terms: -10 + x = -9.962429423 Solving -10 + x = -9.962429423 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 = -9.962429423 + 10 Combine like terms: -10 + 10 = 0 0 + x = -9.962429423 + 10 x = -9.962429423 + 10 Combine like terms: -9.962429423 + 10 = 0.037570577 x = 0.037570577 Simplifying x = 0.037570577

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.962429423, 0.037570577}

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