2x^2+48x-81=0

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Solution for 2x^2+48x-81=0 equation:


Simplifying
2x2 + 48x + -81 = 0

Reorder the terms:
-81 + 48x + 2x2 = 0

Solving
-81 + 48x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-40.5 + 24x + x2 = 0

Move the constant term to the right:

Add '40.5' to each side of the equation.
-40.5 + 24x + 40.5 + x2 = 0 + 40.5

Reorder the terms:
-40.5 + 40.5 + 24x + x2 = 0 + 40.5

Combine like terms: -40.5 + 40.5 = 0.0
0.0 + 24x + x2 = 0 + 40.5
24x + x2 = 0 + 40.5

Combine like terms: 0 + 40.5 = 40.5
24x + x2 = 40.5

The x term is 24x.  Take half its coefficient (12).
Square it (144) and add it to both sides.

Add '144' to each side of the equation.
24x + 144 + x2 = 40.5 + 144

Reorder the terms:
144 + 24x + x2 = 40.5 + 144

Combine like terms: 40.5 + 144 = 184.5
144 + 24x + x2 = 184.5

Factor a perfect square on the left side:
(x + 12)(x + 12) = 184.5

Calculate the square root of the right side: 13.583077707

Break this problem into two subproblems by setting 
(x + 12) equal to 13.583077707 and -13.583077707.

Subproblem 1

x + 12 = 13.583077707 Simplifying x + 12 = 13.583077707 Reorder the terms: 12 + x = 13.583077707 Solving 12 + x = 13.583077707 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + x = 13.583077707 + -12 Combine like terms: 12 + -12 = 0 0 + x = 13.583077707 + -12 x = 13.583077707 + -12 Combine like terms: 13.583077707 + -12 = 1.583077707 x = 1.583077707 Simplifying x = 1.583077707

Subproblem 2

x + 12 = -13.583077707 Simplifying x + 12 = -13.583077707 Reorder the terms: 12 + x = -13.583077707 Solving 12 + x = -13.583077707 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + x = -13.583077707 + -12 Combine like terms: 12 + -12 = 0 0 + x = -13.583077707 + -12 x = -13.583077707 + -12 Combine like terms: -13.583077707 + -12 = -25.583077707 x = -25.583077707 Simplifying x = -25.583077707

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.583077707, -25.583077707}

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