x^2-10x+5=18

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Solution for x^2-10x+5=18 equation:


Simplifying
x2 + -10x + 5 = 18

Reorder the terms:
5 + -10x + x2 = 18

Solving
5 + -10x + x2 = 18

Solving for variable 'x'.

Reorder the terms:
5 + -18 + -10x + x2 = 18 + -18

Combine like terms: 5 + -18 = -13
-13 + -10x + x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-13 + -10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + -10x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + -10x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -10x + x2 = 0 + 13
-10x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
-10x + x2 = 13

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 13 + 25

Reorder the terms:
25 + -10x + x2 = 13 + 25

Combine like terms: 13 + 25 = 38
25 + -10x + x2 = 38

Factor a perfect square on the left side:
(x + -5)(x + -5) = 38

Calculate the square root of the right side: 6.164414003

Break this problem into two subproblems by setting 
(x + -5) equal to 6.164414003 and -6.164414003.

Subproblem 1

x + -5 = 6.164414003 Simplifying x + -5 = 6.164414003 Reorder the terms: -5 + x = 6.164414003 Solving -5 + x = 6.164414003 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 6.164414003 + 5 Combine like terms: -5 + 5 = 0 0 + x = 6.164414003 + 5 x = 6.164414003 + 5 Combine like terms: 6.164414003 + 5 = 11.164414003 x = 11.164414003 Simplifying x = 11.164414003

Subproblem 2

x + -5 = -6.164414003 Simplifying x + -5 = -6.164414003 Reorder the terms: -5 + x = -6.164414003 Solving -5 + x = -6.164414003 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -6.164414003 + 5 Combine like terms: -5 + 5 = 0 0 + x = -6.164414003 + 5 x = -6.164414003 + 5 Combine like terms: -6.164414003 + 5 = -1.164414003 x = -1.164414003 Simplifying x = -1.164414003

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.164414003, -1.164414003}

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