8x^2+24x-11=0

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Solution for 8x^2+24x-11=0 equation:


Simplifying
8x2 + 24x + -11 = 0

Reorder the terms:
-11 + 24x + 8x2 = 0

Solving
-11 + 24x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-1.375 + 3x + x2 = 0

Move the constant term to the right:

Add '1.375' to each side of the equation.
-1.375 + 3x + 1.375 + x2 = 0 + 1.375

Reorder the terms:
-1.375 + 1.375 + 3x + x2 = 0 + 1.375

Combine like terms: -1.375 + 1.375 = 0.000
0.000 + 3x + x2 = 0 + 1.375
3x + x2 = 0 + 1.375

Combine like terms: 0 + 1.375 = 1.375
3x + x2 = 1.375

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 1.375 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 1.375 + 2.25

Combine like terms: 1.375 + 2.25 = 3.625
2.25 + 3x + x2 = 3.625

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 3.625

Calculate the square root of the right side: 1.903943276

Break this problem into two subproblems by setting 
(x + 1.5) equal to 1.903943276 and -1.903943276.

Subproblem 1

x + 1.5 = 1.903943276 Simplifying x + 1.5 = 1.903943276 Reorder the terms: 1.5 + x = 1.903943276 Solving 1.5 + x = 1.903943276 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 1.903943276 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 1.903943276 + -1.5 x = 1.903943276 + -1.5 Combine like terms: 1.903943276 + -1.5 = 0.403943276 x = 0.403943276 Simplifying x = 0.403943276

Subproblem 2

x + 1.5 = -1.903943276 Simplifying x + 1.5 = -1.903943276 Reorder the terms: 1.5 + x = -1.903943276 Solving 1.5 + x = -1.903943276 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -1.903943276 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -1.903943276 + -1.5 x = -1.903943276 + -1.5 Combine like terms: -1.903943276 + -1.5 = -3.403943276 x = -3.403943276 Simplifying x = -3.403943276

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.403943276, -3.403943276}

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