x*x=25-x

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Solution for x*x=25-x equation:


Simplifying
x * x = 25 + -1x

Multiply x * x
x2 = 25 + -1x

Solving
x2 = 25 + -1x

Solving for variable 'x'.

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

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

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

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

Begin completing the square.

Move the constant term to the right:

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

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

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

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

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
x + 0.25 + x2 = 25 + 0.25

Reorder the terms:
0.25 + x + x2 = 25 + 0.25

Combine like terms: 25 + 0.25 = 25.25
0.25 + x + x2 = 25.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 25.25

Calculate the square root of the right side: 5.024937811

Break this problem into two subproblems by setting 
(x + 0.5) equal to 5.024937811 and -5.024937811.

Subproblem 1

x + 0.5 = 5.024937811 Simplifying x + 0.5 = 5.024937811 Reorder the terms: 0.5 + x = 5.024937811 Solving 0.5 + x = 5.024937811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 5.024937811 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 5.024937811 + -0.5 x = 5.024937811 + -0.5 Combine like terms: 5.024937811 + -0.5 = 4.524937811 x = 4.524937811 Simplifying x = 4.524937811

Subproblem 2

x + 0.5 = -5.024937811 Simplifying x + 0.5 = -5.024937811 Reorder the terms: 0.5 + x = -5.024937811 Solving 0.5 + x = -5.024937811 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -5.024937811 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -5.024937811 + -0.5 x = -5.024937811 + -0.5 Combine like terms: -5.024937811 + -0.5 = -5.524937811 x = -5.524937811 Simplifying x = -5.524937811

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.524937811, -5.524937811}

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