(x-5)(x+5)=x

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Solution for (x-5)(x+5)=x equation:


Simplifying
(x + -5)(x + 5) = x

Reorder the terms:
(-5 + x)(x + 5) = x

Reorder the terms:
(-5 + x)(5 + x) = x

Multiply (-5 + x) * (5 + x)
(-5(5 + x) + x(5 + x)) = x
((5 * -5 + x * -5) + x(5 + x)) = x
((-25 + -5x) + x(5 + x)) = x
(-25 + -5x + (5 * x + x * x)) = x
(-25 + -5x + (5x + x2)) = x

Combine like terms: -5x + 5x = 0
(-25 + 0 + x2) = x
(-25 + x2) = x

Solving
-25 + x2 = x

Solving for variable 'x'.

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

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

Begin completing the square.

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -1x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + -1x + x2 = 0 + 25

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

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

The x term is -1x.  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.
-1x + 0.25 + x2 = 25 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 25 + 0.25

Combine like terms: 25 + 0.25 = 25.25
0.25 + -1x + 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 = 5.524937811 x = 5.524937811 Simplifying x = 5.524937811

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 = -4.524937811 x = -4.524937811 Simplifying x = -4.524937811

Solution

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

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