-8x^2+13x+50=0

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Solution for -8x^2+13x+50=0 equation:


Simplifying
-8x2 + 13x + 50 = 0

Reorder the terms:
50 + 13x + -8x2 = 0

Solving
50 + 13x + -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'.
-6.25 + -1.625x + x2 = 0

Move the constant term to the right:

Add '6.25' to each side of the equation.
-6.25 + -1.625x + 6.25 + x2 = 0 + 6.25

Reorder the terms:
-6.25 + 6.25 + -1.625x + x2 = 0 + 6.25

Combine like terms: -6.25 + 6.25 = 0.00
0.00 + -1.625x + x2 = 0 + 6.25
-1.625x + x2 = 0 + 6.25

Combine like terms: 0 + 6.25 = 6.25
-1.625x + x2 = 6.25

The x term is -1.625x.  Take half its coefficient (-0.8125).
Square it (0.66015625) and add it to both sides.

Add '0.66015625' to each side of the equation.
-1.625x + 0.66015625 + x2 = 6.25 + 0.66015625

Reorder the terms:
0.66015625 + -1.625x + x2 = 6.25 + 0.66015625

Combine like terms: 6.25 + 0.66015625 = 6.91015625
0.66015625 + -1.625x + x2 = 6.91015625

Factor a perfect square on the left side:
(x + -0.8125)(x + -0.8125) = 6.91015625

Calculate the square root of the right side: 2.628717606

Break this problem into two subproblems by setting 
(x + -0.8125) equal to 2.628717606 and -2.628717606.

Subproblem 1

x + -0.8125 = 2.628717606 Simplifying x + -0.8125 = 2.628717606 Reorder the terms: -0.8125 + x = 2.628717606 Solving -0.8125 + x = 2.628717606 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8125' to each side of the equation. -0.8125 + 0.8125 + x = 2.628717606 + 0.8125 Combine like terms: -0.8125 + 0.8125 = 0.0000 0.0000 + x = 2.628717606 + 0.8125 x = 2.628717606 + 0.8125 Combine like terms: 2.628717606 + 0.8125 = 3.441217606 x = 3.441217606 Simplifying x = 3.441217606

Subproblem 2

x + -0.8125 = -2.628717606 Simplifying x + -0.8125 = -2.628717606 Reorder the terms: -0.8125 + x = -2.628717606 Solving -0.8125 + x = -2.628717606 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8125' to each side of the equation. -0.8125 + 0.8125 + x = -2.628717606 + 0.8125 Combine like terms: -0.8125 + 0.8125 = 0.0000 0.0000 + x = -2.628717606 + 0.8125 x = -2.628717606 + 0.8125 Combine like terms: -2.628717606 + 0.8125 = -1.816217606 x = -1.816217606 Simplifying x = -1.816217606

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.441217606, -1.816217606}

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