8x^2+2x-9=

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


Simplifying
8x2 + 2x + -9 = 0

Reorder the terms:
-9 + 2x + 8x2 = 0

Solving
-9 + 2x + 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 + 0.25x + x2 = 0

Move the constant term to the right:

Add '1.125' to each side of the equation.
-1.125 + 0.25x + 1.125 + x2 = 0 + 1.125

Reorder the terms:
-1.125 + 1.125 + 0.25x + x2 = 0 + 1.125

Combine like terms: -1.125 + 1.125 = 0.000
0.000 + 0.25x + x2 = 0 + 1.125
0.25x + x2 = 0 + 1.125

Combine like terms: 0 + 1.125 = 1.125
0.25x + x2 = 1.125

The x term is 0.25x.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25x + 0.015625 + x2 = 1.125 + 0.015625

Reorder the terms:
0.015625 + 0.25x + x2 = 1.125 + 0.015625

Combine like terms: 1.125 + 0.015625 = 1.140625
0.015625 + 0.25x + x2 = 1.140625

Factor a perfect square on the left side:
(x + 0.125)(x + 0.125) = 1.140625

Calculate the square root of the right side: 1.068000468

Break this problem into two subproblems by setting 
(x + 0.125) equal to 1.068000468 and -1.068000468.

Subproblem 1

x + 0.125 = 1.068000468 Simplifying x + 0.125 = 1.068000468 Reorder the terms: 0.125 + x = 1.068000468 Solving 0.125 + x = 1.068000468 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = 1.068000468 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = 1.068000468 + -0.125 x = 1.068000468 + -0.125 Combine like terms: 1.068000468 + -0.125 = 0.943000468 x = 0.943000468 Simplifying x = 0.943000468

Subproblem 2

x + 0.125 = -1.068000468 Simplifying x + 0.125 = -1.068000468 Reorder the terms: 0.125 + x = -1.068000468 Solving 0.125 + x = -1.068000468 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = -1.068000468 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = -1.068000468 + -0.125 x = -1.068000468 + -0.125 Combine like terms: -1.068000468 + -0.125 = -1.193000468 x = -1.193000468 Simplifying x = -1.193000468

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.943000468, -1.193000468}

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