8x^2+5x-150=0

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Solution for 8x^2+5x-150=0 equation:


Simplifying
8x2 + 5x + -150 = 0

Reorder the terms:
-150 + 5x + 8x2 = 0

Solving
-150 + 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'.
-18.75 + 0.625x + x2 = 0

Move the constant term to the right:

Add '18.75' to each side of the equation.
-18.75 + 0.625x + 18.75 + x2 = 0 + 18.75

Reorder the terms:
-18.75 + 18.75 + 0.625x + x2 = 0 + 18.75

Combine like terms: -18.75 + 18.75 = 0.00
0.00 + 0.625x + x2 = 0 + 18.75
0.625x + x2 = 0 + 18.75

Combine like terms: 0 + 18.75 = 18.75
0.625x + x2 = 18.75

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 = 18.75 + 0.09765625

Reorder the terms:
0.09765625 + 0.625x + x2 = 18.75 + 0.09765625

Combine like terms: 18.75 + 0.09765625 = 18.84765625
0.09765625 + 0.625x + x2 = 18.84765625

Factor a perfect square on the left side:
(x + 0.3125)(x + 0.3125) = 18.84765625

Calculate the square root of the right side: 4.341388747

Break this problem into two subproblems by setting 
(x + 0.3125) equal to 4.341388747 and -4.341388747.

Subproblem 1

x + 0.3125 = 4.341388747 Simplifying x + 0.3125 = 4.341388747 Reorder the terms: 0.3125 + x = 4.341388747 Solving 0.3125 + x = 4.341388747 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 = 4.341388747 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + x = 4.341388747 + -0.3125 x = 4.341388747 + -0.3125 Combine like terms: 4.341388747 + -0.3125 = 4.028888747 x = 4.028888747 Simplifying x = 4.028888747

Subproblem 2

x + 0.3125 = -4.341388747 Simplifying x + 0.3125 = -4.341388747 Reorder the terms: 0.3125 + x = -4.341388747 Solving 0.3125 + x = -4.341388747 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 = -4.341388747 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + x = -4.341388747 + -0.3125 x = -4.341388747 + -0.3125 Combine like terms: -4.341388747 + -0.3125 = -4.653888747 x = -4.653888747 Simplifying x = -4.653888747

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.028888747, -4.653888747}

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