8x^2+3x-100=0

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Solution for 8x^2+3x-100=0 equation:


Simplifying
8x2 + 3x + -100 = 0

Reorder the terms:
-100 + 3x + 8x2 = 0

Solving
-100 + 3x + 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'.
-12.5 + 0.375x + x2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + 0.375x + 12.5 + x2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + 0.375x + x2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + 0.375x + x2 = 0 + 12.5
0.375x + x2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
0.375x + x2 = 12.5

The x term is 0.375x.  Take half its coefficient (0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
0.375x + 0.03515625 + x2 = 12.5 + 0.03515625

Reorder the terms:
0.03515625 + 0.375x + x2 = 12.5 + 0.03515625

Combine like terms: 12.5 + 0.03515625 = 12.53515625
0.03515625 + 0.375x + x2 = 12.53515625

Factor a perfect square on the left side:
(x + 0.1875)(x + 0.1875) = 12.53515625

Calculate the square root of the right side: 3.54050226

Break this problem into two subproblems by setting 
(x + 0.1875) equal to 3.54050226 and -3.54050226.

Subproblem 1

x + 0.1875 = 3.54050226 Simplifying x + 0.1875 = 3.54050226 Reorder the terms: 0.1875 + x = 3.54050226 Solving 0.1875 + x = 3.54050226 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1875' to each side of the equation. 0.1875 + -0.1875 + x = 3.54050226 + -0.1875 Combine like terms: 0.1875 + -0.1875 = 0.0000 0.0000 + x = 3.54050226 + -0.1875 x = 3.54050226 + -0.1875 Combine like terms: 3.54050226 + -0.1875 = 3.35300226 x = 3.35300226 Simplifying x = 3.35300226

Subproblem 2

x + 0.1875 = -3.54050226 Simplifying x + 0.1875 = -3.54050226 Reorder the terms: 0.1875 + x = -3.54050226 Solving 0.1875 + x = -3.54050226 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1875' to each side of the equation. 0.1875 + -0.1875 + x = -3.54050226 + -0.1875 Combine like terms: 0.1875 + -0.1875 = 0.0000 0.0000 + x = -3.54050226 + -0.1875 x = -3.54050226 + -0.1875 Combine like terms: -3.54050226 + -0.1875 = -3.72800226 x = -3.72800226 Simplifying x = -3.72800226

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.35300226, -3.72800226}

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