8x^2+5x-9=0

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Solution for 8x^2+5x-9=0 equation:


Simplifying
8x2 + 5x + -9 = 0

Reorder the terms:
-9 + 5x + 8x2 = 0

Solving
-9 + 5x + 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'.
-1.125 + 0.625x + x2 = 0

Move the constant term to the right:

Add '1.125' to each side of the equation.
-1.125 + 0.625x + 1.125 + x2 = 0 + 1.125

Reorder the terms:
-1.125 + 1.125 + 0.625x + x2 = 0 + 1.125

Combine like terms: -1.125 + 1.125 = 0.000
0.000 + 0.625x + x2 = 0 + 1.125
0.625x + x2 = 0 + 1.125

Combine like terms: 0 + 1.125 = 1.125
0.625x + x2 = 1.125

The x term is 0.625x.  Take half its coefficient (0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
0.625x + 0.09765625 + x2 = 1.125 + 0.09765625

Reorder the terms:
0.09765625 + 0.625x + x2 = 1.125 + 0.09765625

Combine like terms: 1.125 + 0.09765625 = 1.22265625
0.09765625 + 0.625x + x2 = 1.22265625

Factor a perfect square on the left side:
(x + 0.3125)(x + 0.3125) = 1.22265625

Calculate the square root of the right side: 1.105737876

Break this problem into two subproblems by setting 
(x + 0.3125) equal to 1.105737876 and -1.105737876.

Subproblem 1

x + 0.3125 = 1.105737876 Simplifying x + 0.3125 = 1.105737876 Reorder the terms: 0.3125 + x = 1.105737876 Solving 0.3125 + x = 1.105737876 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3125' to each side of the equation. 0.3125 + -0.3125 + x = 1.105737876 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + x = 1.105737876 + -0.3125 x = 1.105737876 + -0.3125 Combine like terms: 1.105737876 + -0.3125 = 0.793237876 x = 0.793237876 Simplifying x = 0.793237876

Subproblem 2

x + 0.3125 = -1.105737876 Simplifying x + 0.3125 = -1.105737876 Reorder the terms: 0.3125 + x = -1.105737876 Solving 0.3125 + x = -1.105737876 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3125' to each side of the equation. 0.3125 + -0.3125 + x = -1.105737876 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + x = -1.105737876 + -0.3125 x = -1.105737876 + -0.3125 Combine like terms: -1.105737876 + -0.3125 = -1.418237876 x = -1.418237876 Simplifying x = -1.418237876

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.793237876, -1.418237876}

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