8x^2+9x-24=0

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Solution for 8x^2+9x-24=0 equation:


Simplifying
8x2 + 9x + -24 = 0

Reorder the terms:
-24 + 9x + 8x2 = 0

Solving
-24 + 9x + 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'.
-3 + 1.125x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 1.125x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 1.125x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 1.125x + x2 = 0 + 3
1.125x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
1.125x + x2 = 3

The x term is 1.125x.  Take half its coefficient (0.5625).
Square it (0.31640625) and add it to both sides.

Add '0.31640625' to each side of the equation.
1.125x + 0.31640625 + x2 = 3 + 0.31640625

Reorder the terms:
0.31640625 + 1.125x + x2 = 3 + 0.31640625

Combine like terms: 3 + 0.31640625 = 3.31640625
0.31640625 + 1.125x + x2 = 3.31640625

Factor a perfect square on the left side:
(x + 0.5625)(x + 0.5625) = 3.31640625

Calculate the square root of the right side: 1.821100286

Break this problem into two subproblems by setting 
(x + 0.5625) equal to 1.821100286 and -1.821100286.

Subproblem 1

x + 0.5625 = 1.821100286 Simplifying x + 0.5625 = 1.821100286 Reorder the terms: 0.5625 + x = 1.821100286 Solving 0.5625 + x = 1.821100286 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5625' to each side of the equation. 0.5625 + -0.5625 + x = 1.821100286 + -0.5625 Combine like terms: 0.5625 + -0.5625 = 0.0000 0.0000 + x = 1.821100286 + -0.5625 x = 1.821100286 + -0.5625 Combine like terms: 1.821100286 + -0.5625 = 1.258600286 x = 1.258600286 Simplifying x = 1.258600286

Subproblem 2

x + 0.5625 = -1.821100286 Simplifying x + 0.5625 = -1.821100286 Reorder the terms: 0.5625 + x = -1.821100286 Solving 0.5625 + x = -1.821100286 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5625' to each side of the equation. 0.5625 + -0.5625 + x = -1.821100286 + -0.5625 Combine like terms: 0.5625 + -0.5625 = 0.0000 0.0000 + x = -1.821100286 + -0.5625 x = -1.821100286 + -0.5625 Combine like terms: -1.821100286 + -0.5625 = -2.383600286 x = -2.383600286 Simplifying x = -2.383600286

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.258600286, -2.383600286}

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