10x^2-41x=21

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Solution for 10x^2-41x=21 equation:


Simplifying
10x2 + -41x = 21

Reorder the terms:
-41x + 10x2 = 21

Solving
-41x + 10x2 = 21

Solving for variable 'x'.

Reorder the terms:
-21 + -41x + 10x2 = 21 + -21

Combine like terms: 21 + -21 = 0
-21 + -41x + 10x2 = 0

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

Divide each side by '10'.
-2.1 + -4.1x + x2 = 0

Move the constant term to the right:

Add '2.1' to each side of the equation.
-2.1 + -4.1x + 2.1 + x2 = 0 + 2.1

Reorder the terms:
-2.1 + 2.1 + -4.1x + x2 = 0 + 2.1

Combine like terms: -2.1 + 2.1 = 0.0
0.0 + -4.1x + x2 = 0 + 2.1
-4.1x + x2 = 0 + 2.1

Combine like terms: 0 + 2.1 = 2.1
-4.1x + x2 = 2.1

The x term is -4.1x.  Take half its coefficient (-2.05).
Square it (4.2025) and add it to both sides.

Add '4.2025' to each side of the equation.
-4.1x + 4.2025 + x2 = 2.1 + 4.2025

Reorder the terms:
4.2025 + -4.1x + x2 = 2.1 + 4.2025

Combine like terms: 2.1 + 4.2025 = 6.3025
4.2025 + -4.1x + x2 = 6.3025

Factor a perfect square on the left side:
(x + -2.05)(x + -2.05) = 6.3025

Calculate the square root of the right side: 2.510478042

Break this problem into two subproblems by setting 
(x + -2.05) equal to 2.510478042 and -2.510478042.

Subproblem 1

x + -2.05 = 2.510478042 Simplifying x + -2.05 = 2.510478042 Reorder the terms: -2.05 + x = 2.510478042 Solving -2.05 + x = 2.510478042 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.05' to each side of the equation. -2.05 + 2.05 + x = 2.510478042 + 2.05 Combine like terms: -2.05 + 2.05 = 0.00 0.00 + x = 2.510478042 + 2.05 x = 2.510478042 + 2.05 Combine like terms: 2.510478042 + 2.05 = 4.560478042 x = 4.560478042 Simplifying x = 4.560478042

Subproblem 2

x + -2.05 = -2.510478042 Simplifying x + -2.05 = -2.510478042 Reorder the terms: -2.05 + x = -2.510478042 Solving -2.05 + x = -2.510478042 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.05' to each side of the equation. -2.05 + 2.05 + x = -2.510478042 + 2.05 Combine like terms: -2.05 + 2.05 = 0.00 0.00 + x = -2.510478042 + 2.05 x = -2.510478042 + 2.05 Combine like terms: -2.510478042 + 2.05 = -0.460478042 x = -0.460478042 Simplifying x = -0.460478042

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.560478042, -0.460478042}

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