-0.01x^2+0.4x+5.9=0

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Solution for -0.01x^2+0.4x+5.9=0 equation:


Simplifying
-0.01x2 + 0.4x + 5.9 = 0

Reorder the terms:
5.9 + 0.4x + -0.01x2 = 0

Solving
5.9 + 0.4x + -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 + -40x + x2 = 0

Move the constant term to the right:

Add '590' to each side of the equation.
-590 + -40x + 590 + x2 = 0 + 590

Reorder the terms:
-590 + 590 + -40x + x2 = 0 + 590

Combine like terms: -590 + 590 = 0
0 + -40x + x2 = 0 + 590
-40x + x2 = 0 + 590

Combine like terms: 0 + 590 = 590
-40x + x2 = 590

The x term is -40x.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40x + 400 + x2 = 590 + 400

Reorder the terms:
400 + -40x + x2 = 590 + 400

Combine like terms: 590 + 400 = 990
400 + -40x + x2 = 990

Factor a perfect square on the left side:
(x + -20)(x + -20) = 990

Calculate the square root of the right side: 31.464265445

Break this problem into two subproblems by setting 
(x + -20) equal to 31.464265445 and -31.464265445.

Subproblem 1

x + -20 = 31.464265445 Simplifying x + -20 = 31.464265445 Reorder the terms: -20 + x = 31.464265445 Solving -20 + x = 31.464265445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = 31.464265445 + 20 Combine like terms: -20 + 20 = 0 0 + x = 31.464265445 + 20 x = 31.464265445 + 20 Combine like terms: 31.464265445 + 20 = 51.464265445 x = 51.464265445 Simplifying x = 51.464265445

Subproblem 2

x + -20 = -31.464265445 Simplifying x + -20 = -31.464265445 Reorder the terms: -20 + x = -31.464265445 Solving -20 + x = -31.464265445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = -31.464265445 + 20 Combine like terms: -20 + 20 = 0 0 + x = -31.464265445 + 20 x = -31.464265445 + 20 Combine like terms: -31.464265445 + 20 = -11.464265445 x = -11.464265445 Simplifying x = -11.464265445

Solution

The solution to the problem is based on the solutions from the subproblems. x = {51.464265445, -11.464265445}

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