X^2+18X-288=0

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Solution for X^2+18X-288=0 equation:


Simplifying
X2 + 18X + -288 = 0

Reorder the terms:
-288 + 18X + X2 = 0

Solving
-288 + 18X + X2 = 0

Solving for variable 'X'.

Begin completing the square.

Move the constant term to the right:

Add '288' to each side of the equation.
-288 + 18X + 288 + X2 = 0 + 288

Reorder the terms:
-288 + 288 + 18X + X2 = 0 + 288

Combine like terms: -288 + 288 = 0
0 + 18X + X2 = 0 + 288
18X + X2 = 0 + 288

Combine like terms: 0 + 288 = 288
18X + X2 = 288

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 = 288 + 81

Reorder the terms:
81 + 18X + X2 = 288 + 81

Combine like terms: 288 + 81 = 369
81 + 18X + X2 = 369

Factor a perfect square on the left side:
(X + 9)(X + 9) = 369

Calculate the square root of the right side: 19.209372712

Break this problem into two subproblems by setting 
(X + 9) equal to 19.209372712 and -19.209372712.

Subproblem 1

X + 9 = 19.209372712 Simplifying X + 9 = 19.209372712 Reorder the terms: 9 + X = 19.209372712 Solving 9 + X = 19.209372712 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 = 19.209372712 + -9 Combine like terms: 9 + -9 = 0 0 + X = 19.209372712 + -9 X = 19.209372712 + -9 Combine like terms: 19.209372712 + -9 = 10.209372712 X = 10.209372712 Simplifying X = 10.209372712

Subproblem 2

X + 9 = -19.209372712 Simplifying X + 9 = -19.209372712 Reorder the terms: 9 + X = -19.209372712 Solving 9 + X = -19.209372712 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 = -19.209372712 + -9 Combine like terms: 9 + -9 = 0 0 + X = -19.209372712 + -9 X = -19.209372712 + -9 Combine like terms: -19.209372712 + -9 = -28.209372712 X = -28.209372712 Simplifying X = -28.209372712

Solution

The solution to the problem is based on the solutions from the subproblems. X = {10.209372712, -28.209372712}

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