=-0.005x^2+0.41x-5.1

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Solution for =-0.005x^2+0.41x-5.1 equation:


Simplifying
0 = -0.005x2 + 0.41x + -5.1

Reorder the terms:
0 = -5.1 + 0.41x + -0.005x2

Solving
0 = -5.1 + 0.41x + -0.005x2

Solving for variable 'x'.

Combine like terms: 0 + 5.1 = 5.1
5.1 + -0.41x + 0.005x2 = -5.1 + 0.41x + -0.005x2 + 5.1 + -0.41x + 0.005x2

Reorder the terms:
5.1 + -0.41x + 0.005x2 = -5.1 + 5.1 + 0.41x + -0.41x + -0.005x2 + 0.005x2

Combine like terms: -5.1 + 5.1 = 0.0
5.1 + -0.41x + 0.005x2 = 0.0 + 0.41x + -0.41x + -0.005x2 + 0.005x2
5.1 + -0.41x + 0.005x2 = 0.41x + -0.41x + -0.005x2 + 0.005x2

Combine like terms: 0.41x + -0.41x = 0.00
5.1 + -0.41x + 0.005x2 = 0.00 + -0.005x2 + 0.005x2
5.1 + -0.41x + 0.005x2 = -0.005x2 + 0.005x2

Combine like terms: -0.005x2 + 0.005x2 = 0.000
5.1 + -0.41x + 0.005x2 = 0.000

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

Divide each side by '0.005'.
1020 + -82x + x2 = 0

Move the constant term to the right:

Add '-1020' to each side of the equation.
1020 + -82x + -1020 + x2 = 0 + -1020

Reorder the terms:
1020 + -1020 + -82x + x2 = 0 + -1020

Combine like terms: 1020 + -1020 = 0
0 + -82x + x2 = 0 + -1020
-82x + x2 = 0 + -1020

Combine like terms: 0 + -1020 = -1020
-82x + x2 = -1020

The x term is -82x.  Take half its coefficient (-41).
Square it (1681) and add it to both sides.

Add '1681' to each side of the equation.
-82x + 1681 + x2 = -1020 + 1681

Reorder the terms:
1681 + -82x + x2 = -1020 + 1681

Combine like terms: -1020 + 1681 = 661
1681 + -82x + x2 = 661

Factor a perfect square on the left side:
(x + -41)(x + -41) = 661

Calculate the square root of the right side: 25.709920264

Break this problem into two subproblems by setting 
(x + -41) equal to 25.709920264 and -25.709920264.

Subproblem 1

x + -41 = 25.709920264 Simplifying x + -41 = 25.709920264 Reorder the terms: -41 + x = 25.709920264 Solving -41 + x = 25.709920264 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '41' to each side of the equation. -41 + 41 + x = 25.709920264 + 41 Combine like terms: -41 + 41 = 0 0 + x = 25.709920264 + 41 x = 25.709920264 + 41 Combine like terms: 25.709920264 + 41 = 66.709920264 x = 66.709920264 Simplifying x = 66.709920264

Subproblem 2

x + -41 = -25.709920264 Simplifying x + -41 = -25.709920264 Reorder the terms: -41 + x = -25.709920264 Solving -41 + x = -25.709920264 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '41' to each side of the equation. -41 + 41 + x = -25.709920264 + 41 Combine like terms: -41 + 41 = 0 0 + x = -25.709920264 + 41 x = -25.709920264 + 41 Combine like terms: -25.709920264 + 41 = 15.290079736 x = 15.290079736 Simplifying x = 15.290079736

Solution

The solution to the problem is based on the solutions from the subproblems. x = {66.709920264, 15.290079736}

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