.20(25-x)=x^2

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Solution for .20(25-x)=x^2 equation:


Simplifying
0.20(25 + -1x) = x2
(25 * 0.20 + -1x * 0.20) = x2
(5 + -0.2x) = x2

Solving
5 + -0.2x = x2

Solving for variable 'x'.

Combine like terms: x2 + -1x2 = 0
5 + -0.2x + -1x2 = 0

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

Divide each side by '-1'.
-5 + 0.2x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 0.2x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + 0.2x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 0.2x + x2 = 0 + 5
0.2x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
0.2x + x2 = 5

The x term is 0.2x.  Take half its coefficient (0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
0.2x + 0.01 + x2 = 5 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 5 + 0.01

Combine like terms: 5 + 0.01 = 5.01
0.01 + 0.2x + x2 = 5.01

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 5.01

Calculate the square root of the right side: 2.238302929

Break this problem into two subproblems by setting 
(x + 0.1) equal to 2.238302929 and -2.238302929.

Subproblem 1

x + 0.1 = 2.238302929 Simplifying x + 0.1 = 2.238302929 Reorder the terms: 0.1 + x = 2.238302929 Solving 0.1 + x = 2.238302929 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = 2.238302929 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 2.238302929 + -0.1 x = 2.238302929 + -0.1 Combine like terms: 2.238302929 + -0.1 = 2.138302929 x = 2.138302929 Simplifying x = 2.138302929

Subproblem 2

x + 0.1 = -2.238302929 Simplifying x + 0.1 = -2.238302929 Reorder the terms: 0.1 + x = -2.238302929 Solving 0.1 + x = -2.238302929 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1' to each side of the equation. 0.1 + -0.1 + x = -2.238302929 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -2.238302929 + -0.1 x = -2.238302929 + -0.1 Combine like terms: -2.238302929 + -0.1 = -2.338302929 x = -2.338302929 Simplifying x = -2.338302929

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.138302929, -2.338302929}

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