8x^2+33x-4=0

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Solution for 8x^2+33x-4=0 equation:


Simplifying
8x2 + 33x + -4 = 0

Reorder the terms:
-4 + 33x + 8x2 = 0

Solving
-4 + 33x + 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'.
-0.5 + 4.125x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 4.125x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 4.125x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 4.125x + x2 = 0 + 0.5
4.125x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
4.125x + x2 = 0.5

The x term is 4.125x.  Take half its coefficient (2.0625).
Square it (4.25390625) and add it to both sides.

Add '4.25390625' to each side of the equation.
4.125x + 4.25390625 + x2 = 0.5 + 4.25390625

Reorder the terms:
4.25390625 + 4.125x + x2 = 0.5 + 4.25390625

Combine like terms: 0.5 + 4.25390625 = 4.75390625
4.25390625 + 4.125x + x2 = 4.75390625

Factor a perfect square on the left side:
(x + 2.0625)(x + 2.0625) = 4.75390625

Calculate the square root of the right side: 2.180345443

Break this problem into two subproblems by setting 
(x + 2.0625) equal to 2.180345443 and -2.180345443.

Subproblem 1

x + 2.0625 = 2.180345443 Simplifying x + 2.0625 = 2.180345443 Reorder the terms: 2.0625 + x = 2.180345443 Solving 2.0625 + x = 2.180345443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.0625' to each side of the equation. 2.0625 + -2.0625 + x = 2.180345443 + -2.0625 Combine like terms: 2.0625 + -2.0625 = 0.0000 0.0000 + x = 2.180345443 + -2.0625 x = 2.180345443 + -2.0625 Combine like terms: 2.180345443 + -2.0625 = 0.117845443 x = 0.117845443 Simplifying x = 0.117845443

Subproblem 2

x + 2.0625 = -2.180345443 Simplifying x + 2.0625 = -2.180345443 Reorder the terms: 2.0625 + x = -2.180345443 Solving 2.0625 + x = -2.180345443 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.0625' to each side of the equation. 2.0625 + -2.0625 + x = -2.180345443 + -2.0625 Combine like terms: 2.0625 + -2.0625 = 0.0000 0.0000 + x = -2.180345443 + -2.0625 x = -2.180345443 + -2.0625 Combine like terms: -2.180345443 + -2.0625 = -4.242845443 x = -4.242845443 Simplifying x = -4.242845443

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.117845443, -4.242845443}

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