x^2=18x+53

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Solution for x^2=18x+53 equation:


Simplifying
x2 = 18x + 53

Reorder the terms:
x2 = 53 + 18x

Solving
x2 = 53 + 18x

Solving for variable 'x'.

Reorder the terms:
-53 + -18x + x2 = 53 + 18x + -53 + -18x

Reorder the terms:
-53 + -18x + x2 = 53 + -53 + 18x + -18x

Combine like terms: 53 + -53 = 0
-53 + -18x + x2 = 0 + 18x + -18x
-53 + -18x + x2 = 18x + -18x

Combine like terms: 18x + -18x = 0
-53 + -18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '53' to each side of the equation.
-53 + -18x + 53 + x2 = 0 + 53

Reorder the terms:
-53 + 53 + -18x + x2 = 0 + 53

Combine like terms: -53 + 53 = 0
0 + -18x + x2 = 0 + 53
-18x + x2 = 0 + 53

Combine like terms: 0 + 53 = 53
-18x + x2 = 53

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = 53 + 81

Reorder the terms:
81 + -18x + x2 = 53 + 81

Combine like terms: 53 + 81 = 134
81 + -18x + x2 = 134

Factor a perfect square on the left side:
(x + -9)(x + -9) = 134

Calculate the square root of the right side: 11.575836903

Break this problem into two subproblems by setting 
(x + -9) equal to 11.575836903 and -11.575836903.

Subproblem 1

x + -9 = 11.575836903 Simplifying x + -9 = 11.575836903 Reorder the terms: -9 + x = 11.575836903 Solving -9 + x = 11.575836903 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 11.575836903 + 9 Combine like terms: -9 + 9 = 0 0 + x = 11.575836903 + 9 x = 11.575836903 + 9 Combine like terms: 11.575836903 + 9 = 20.575836903 x = 20.575836903 Simplifying x = 20.575836903

Subproblem 2

x + -9 = -11.575836903 Simplifying x + -9 = -11.575836903 Reorder the terms: -9 + x = -11.575836903 Solving -9 + x = -11.575836903 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -11.575836903 + 9 Combine like terms: -9 + 9 = 0 0 + x = -11.575836903 + 9 x = -11.575836903 + 9 Combine like terms: -11.575836903 + 9 = -2.575836903 x = -2.575836903 Simplifying x = -2.575836903

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.575836903, -2.575836903}

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