18-2x=x^2-25

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Solution for 18-2x=x^2-25 equation:


Simplifying
18 + -2x = x2 + -25

Reorder the terms:
18 + -2x = -25 + x2

Solving
18 + -2x = -25 + x2

Solving for variable 'x'.

Reorder the terms:
18 + 25 + -2x + -1x2 = -25 + x2 + 25 + -1x2

Combine like terms: 18 + 25 = 43
43 + -2x + -1x2 = -25 + x2 + 25 + -1x2

Reorder the terms:
43 + -2x + -1x2 = -25 + 25 + x2 + -1x2

Combine like terms: -25 + 25 = 0
43 + -2x + -1x2 = 0 + x2 + -1x2
43 + -2x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
43 + -2x + -1x2 = 0

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

Divide each side by '-1'.
-43 + 2x + x2 = 0

Move the constant term to the right:

Add '43' to each side of the equation.
-43 + 2x + 43 + x2 = 0 + 43

Reorder the terms:
-43 + 43 + 2x + x2 = 0 + 43

Combine like terms: -43 + 43 = 0
0 + 2x + x2 = 0 + 43
2x + x2 = 0 + 43

Combine like terms: 0 + 43 = 43
2x + x2 = 43

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 43 + 1

Reorder the terms:
1 + 2x + x2 = 43 + 1

Combine like terms: 43 + 1 = 44
1 + 2x + x2 = 44

Factor a perfect square on the left side:
(x + 1)(x + 1) = 44

Calculate the square root of the right side: 6.633249581

Break this problem into two subproblems by setting 
(x + 1) equal to 6.633249581 and -6.633249581.

Subproblem 1

x + 1 = 6.633249581 Simplifying x + 1 = 6.633249581 Reorder the terms: 1 + x = 6.633249581 Solving 1 + x = 6.633249581 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 6.633249581 + -1 Combine like terms: 1 + -1 = 0 0 + x = 6.633249581 + -1 x = 6.633249581 + -1 Combine like terms: 6.633249581 + -1 = 5.633249581 x = 5.633249581 Simplifying x = 5.633249581

Subproblem 2

x + 1 = -6.633249581 Simplifying x + 1 = -6.633249581 Reorder the terms: 1 + x = -6.633249581 Solving 1 + x = -6.633249581 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -6.633249581 + -1 Combine like terms: 1 + -1 = 0 0 + x = -6.633249581 + -1 x = -6.633249581 + -1 Combine like terms: -6.633249581 + -1 = -7.633249581 x = -7.633249581 Simplifying x = -7.633249581

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.633249581, -7.633249581}

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