x^2+18x=248

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Solution for x^2+18x=248 equation:


Simplifying
x2 + 18x = 248

Reorder the terms:
18x + x2 = 248

Solving
18x + x2 = 248

Solving for variable 'x'.

Reorder the terms:
-248 + 18x + x2 = 248 + -248

Combine like terms: 248 + -248 = 0
-248 + 18x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '248' to each side of the equation.
-248 + 18x + 248 + x2 = 0 + 248

Reorder the terms:
-248 + 248 + 18x + x2 = 0 + 248

Combine like terms: -248 + 248 = 0
0 + 18x + x2 = 0 + 248
18x + x2 = 0 + 248

Combine like terms: 0 + 248 = 248
18x + x2 = 248

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 = 248 + 81

Reorder the terms:
81 + 18x + x2 = 248 + 81

Combine like terms: 248 + 81 = 329
81 + 18x + x2 = 329

Factor a perfect square on the left side:
(x + 9)(x + 9) = 329

Calculate the square root of the right side: 18.138357147

Break this problem into two subproblems by setting 
(x + 9) equal to 18.138357147 and -18.138357147.

Subproblem 1

x + 9 = 18.138357147 Simplifying x + 9 = 18.138357147 Reorder the terms: 9 + x = 18.138357147 Solving 9 + x = 18.138357147 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 = 18.138357147 + -9 Combine like terms: 9 + -9 = 0 0 + x = 18.138357147 + -9 x = 18.138357147 + -9 Combine like terms: 18.138357147 + -9 = 9.138357147 x = 9.138357147 Simplifying x = 9.138357147

Subproblem 2

x + 9 = -18.138357147 Simplifying x + 9 = -18.138357147 Reorder the terms: 9 + x = -18.138357147 Solving 9 + x = -18.138357147 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 = -18.138357147 + -9 Combine like terms: 9 + -9 = 0 0 + x = -18.138357147 + -9 x = -18.138357147 + -9 Combine like terms: -18.138357147 + -9 = -27.138357147 x = -27.138357147 Simplifying x = -27.138357147

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.138357147, -27.138357147}

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