0.05x^2+0.1x-80=0

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Solution for 0.05x^2+0.1x-80=0 equation:


Simplifying
0.05x2 + 0.1x + -80 = 0

Reorder the terms:
-80 + 0.1x + 0.05x2 = 0

Solving
-80 + 0.1x + 0.05x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.05'.
-1600 + 2x + x2 = 0

Move the constant term to the right:

Add '1600' to each side of the equation.
-1600 + 2x + 1600 + x2 = 0 + 1600

Reorder the terms:
-1600 + 1600 + 2x + x2 = 0 + 1600

Combine like terms: -1600 + 1600 = 0
0 + 2x + x2 = 0 + 1600
2x + x2 = 0 + 1600

Combine like terms: 0 + 1600 = 1600
2x + x2 = 1600

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 1600 + 1

Reorder the terms:
1 + 2x + x2 = 1600 + 1

Combine like terms: 1600 + 1 = 1601
1 + 2x + x2 = 1601

Factor a perfect square on the left side:
(x + 1)(x + 1) = 1601

Calculate the square root of the right side: 40.012498047

Break this problem into two subproblems by setting 
(x + 1) equal to 40.012498047 and -40.012498047.

Subproblem 1

x + 1 = 40.012498047 Simplifying x + 1 = 40.012498047 Reorder the terms: 1 + x = 40.012498047 Solving 1 + x = 40.012498047 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 40.012498047 + -1 Combine like terms: 1 + -1 = 0 0 + x = 40.012498047 + -1 x = 40.012498047 + -1 Combine like terms: 40.012498047 + -1 = 39.012498047 x = 39.012498047 Simplifying x = 39.012498047

Subproblem 2

x + 1 = -40.012498047 Simplifying x + 1 = -40.012498047 Reorder the terms: 1 + x = -40.012498047 Solving 1 + x = -40.012498047 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -40.012498047 + -1 Combine like terms: 1 + -1 = 0 0 + x = -40.012498047 + -1 x = -40.012498047 + -1 Combine like terms: -40.012498047 + -1 = -41.012498047 x = -41.012498047 Simplifying x = -41.012498047

Solution

The solution to the problem is based on the solutions from the subproblems. x = {39.012498047, -41.012498047}

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