-0.01x^2+.8x+5.9=0

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Solution for -0.01x^2+.8x+5.9=0 equation:


Simplifying
-0.01x2 + 0.8x + 5.9 = 0

Reorder the terms:
5.9 + 0.8x + -0.01x2 = 0

Solving
5.9 + 0.8x + -0.01x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.01 the coefficient of the squared term: 

Divide each side by '-0.01'.
-590 + -80x + x2 = 0

Move the constant term to the right:

Add '590' to each side of the equation.
-590 + -80x + 590 + x2 = 0 + 590

Reorder the terms:
-590 + 590 + -80x + x2 = 0 + 590

Combine like terms: -590 + 590 = 0
0 + -80x + x2 = 0 + 590
-80x + x2 = 0 + 590

Combine like terms: 0 + 590 = 590
-80x + x2 = 590

The x term is -80x.  Take half its coefficient (-40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
-80x + 1600 + x2 = 590 + 1600

Reorder the terms:
1600 + -80x + x2 = 590 + 1600

Combine like terms: 590 + 1600 = 2190
1600 + -80x + x2 = 2190

Factor a perfect square on the left side:
(x + -40)(x + -40) = 2190

Calculate the square root of the right side: 46.797435827

Break this problem into two subproblems by setting 
(x + -40) equal to 46.797435827 and -46.797435827.

Subproblem 1

x + -40 = 46.797435827 Simplifying x + -40 = 46.797435827 Reorder the terms: -40 + x = 46.797435827 Solving -40 + x = 46.797435827 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = 46.797435827 + 40 Combine like terms: -40 + 40 = 0 0 + x = 46.797435827 + 40 x = 46.797435827 + 40 Combine like terms: 46.797435827 + 40 = 86.797435827 x = 86.797435827 Simplifying x = 86.797435827

Subproblem 2

x + -40 = -46.797435827 Simplifying x + -40 = -46.797435827 Reorder the terms: -40 + x = -46.797435827 Solving -40 + x = -46.797435827 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = -46.797435827 + 40 Combine like terms: -40 + 40 = 0 0 + x = -46.797435827 + 40 x = -46.797435827 + 40 Combine like terms: -46.797435827 + 40 = -6.797435827 x = -6.797435827 Simplifying x = -6.797435827

Solution

The solution to the problem is based on the solutions from the subproblems. x = {86.797435827, -6.797435827}

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