2x^2+21x-96=0

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Solution for 2x^2+21x-96=0 equation:


Simplifying
2x2 + 21x + -96 = 0

Reorder the terms:
-96 + 21x + 2x2 = 0

Solving
-96 + 21x + 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'.
-48 + 10.5x + x2 = 0

Move the constant term to the right:

Add '48' to each side of the equation.
-48 + 10.5x + 48 + x2 = 0 + 48

Reorder the terms:
-48 + 48 + 10.5x + x2 = 0 + 48

Combine like terms: -48 + 48 = 0
0 + 10.5x + x2 = 0 + 48
10.5x + x2 = 0 + 48

Combine like terms: 0 + 48 = 48
10.5x + x2 = 48

The x term is 10.5x.  Take half its coefficient (5.25).
Square it (27.5625) and add it to both sides.

Add '27.5625' to each side of the equation.
10.5x + 27.5625 + x2 = 48 + 27.5625

Reorder the terms:
27.5625 + 10.5x + x2 = 48 + 27.5625

Combine like terms: 48 + 27.5625 = 75.5625
27.5625 + 10.5x + x2 = 75.5625

Factor a perfect square on the left side:
(x + 5.25)(x + 5.25) = 75.5625

Calculate the square root of the right side: 8.692669325

Break this problem into two subproblems by setting 
(x + 5.25) equal to 8.692669325 and -8.692669325.

Subproblem 1

x + 5.25 = 8.692669325 Simplifying x + 5.25 = 8.692669325 Reorder the terms: 5.25 + x = 8.692669325 Solving 5.25 + x = 8.692669325 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + x = 8.692669325 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = 8.692669325 + -5.25 x = 8.692669325 + -5.25 Combine like terms: 8.692669325 + -5.25 = 3.442669325 x = 3.442669325 Simplifying x = 3.442669325

Subproblem 2

x + 5.25 = -8.692669325 Simplifying x + 5.25 = -8.692669325 Reorder the terms: 5.25 + x = -8.692669325 Solving 5.25 + x = -8.692669325 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + x = -8.692669325 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = -8.692669325 + -5.25 x = -8.692669325 + -5.25 Combine like terms: -8.692669325 + -5.25 = -13.942669325 x = -13.942669325 Simplifying x = -13.942669325

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.442669325, -13.942669325}

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