-x^2-18x+48=0

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Solution for -x^2-18x+48=0 equation:


Simplifying
-1x2 + -18x + 48 = 0

Reorder the terms:
48 + -18x + -1x2 = 0

Solving
48 + -18x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-48 + 18x + x2 = 0

Move the constant term to the right:

Add '48' to each side of the equation.
-48 + 18x + 48 + x2 = 0 + 48

Reorder the terms:
-48 + 48 + 18x + x2 = 0 + 48

Combine like terms: -48 + 48 = 0
0 + 18x + x2 = 0 + 48
18x + x2 = 0 + 48

Combine like terms: 0 + 48 = 48
18x + x2 = 48

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 = 48 + 81

Reorder the terms:
81 + 18x + x2 = 48 + 81

Combine like terms: 48 + 81 = 129
81 + 18x + x2 = 129

Factor a perfect square on the left side:
(x + 9)(x + 9) = 129

Calculate the square root of the right side: 11.357816692

Break this problem into two subproblems by setting 
(x + 9) equal to 11.357816692 and -11.357816692.

Subproblem 1

x + 9 = 11.357816692 Simplifying x + 9 = 11.357816692 Reorder the terms: 9 + x = 11.357816692 Solving 9 + x = 11.357816692 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 = 11.357816692 + -9 Combine like terms: 9 + -9 = 0 0 + x = 11.357816692 + -9 x = 11.357816692 + -9 Combine like terms: 11.357816692 + -9 = 2.357816692 x = 2.357816692 Simplifying x = 2.357816692

Subproblem 2

x + 9 = -11.357816692 Simplifying x + 9 = -11.357816692 Reorder the terms: 9 + x = -11.357816692 Solving 9 + x = -11.357816692 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 = -11.357816692 + -9 Combine like terms: 9 + -9 = 0 0 + x = -11.357816692 + -9 x = -11.357816692 + -9 Combine like terms: -11.357816692 + -9 = -20.357816692 x = -20.357816692 Simplifying x = -20.357816692

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.357816692, -20.357816692}

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