x^2+12=18x

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Solution for x^2+12=18x equation:


Simplifying
x2 + 12 = 18x

Reorder the terms:
12 + x2 = 18x

Solving
12 + x2 = 18x

Solving for variable 'x'.

Reorder the terms:
12 + -18x + x2 = 18x + -18x

Combine like terms: 18x + -18x = 0
12 + -18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -18x + -12 + x2 = 0 + -12

Reorder the terms:
12 + -12 + -18x + x2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -18x + x2 = 0 + -12
-18x + x2 = 0 + -12

Combine like terms: 0 + -12 = -12
-18x + x2 = -12

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 = -12 + 81

Reorder the terms:
81 + -18x + x2 = -12 + 81

Combine like terms: -12 + 81 = 69
81 + -18x + x2 = 69

Factor a perfect square on the left side:
(x + -9)(x + -9) = 69

Calculate the square root of the right side: 8.306623863

Break this problem into two subproblems by setting 
(x + -9) equal to 8.306623863 and -8.306623863.

Subproblem 1

x + -9 = 8.306623863 Simplifying x + -9 = 8.306623863 Reorder the terms: -9 + x = 8.306623863 Solving -9 + x = 8.306623863 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 = 8.306623863 + 9 Combine like terms: -9 + 9 = 0 0 + x = 8.306623863 + 9 x = 8.306623863 + 9 Combine like terms: 8.306623863 + 9 = 17.306623863 x = 17.306623863 Simplifying x = 17.306623863

Subproblem 2

x + -9 = -8.306623863 Simplifying x + -9 = -8.306623863 Reorder the terms: -9 + x = -8.306623863 Solving -9 + x = -8.306623863 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 = -8.306623863 + 9 Combine like terms: -9 + 9 = 0 0 + x = -8.306623863 + 9 x = -8.306623863 + 9 Combine like terms: -8.306623863 + 9 = 0.693376137 x = 0.693376137 Simplifying x = 0.693376137

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.306623863, 0.693376137}

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