(2x^2)+21x-6.1=0

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Solution for (2x^2)+21x-6.1=0 equation:


Simplifying
(2x2) + 21x + -6.1 = 0

Reorder the terms:
-6.1 + 21x + (2x2) = 0

Solving
-6.1 + 21x + (2x2) = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-3.05 + 10.5x + x2 = 0

Move the constant term to the right:

Add '3.05' to each side of the equation.
-3.05 + 10.5x + 3.05 + x2 = 0 + 3.05

Reorder the terms:
-3.05 + 3.05 + 10.5x + x2 = 0 + 3.05

Combine like terms: -3.05 + 3.05 = 0.00
0.00 + 10.5x + x2 = 0 + 3.05
10.5x + x2 = 0 + 3.05

Combine like terms: 0 + 3.05 = 3.05
10.5x + x2 = 3.05

The x term is 10.5x.  Take half its coefficient (5.25).
Square it (27.5625) and add it to both sides.

Add '27.5625' to each side of the equation.
10.5x + 27.5625 + x2 = 3.05 + 27.5625

Reorder the terms:
27.5625 + 10.5x + x2 = 3.05 + 27.5625

Combine like terms: 3.05 + 27.5625 = 30.6125
27.5625 + 10.5x + x2 = 30.6125

Factor a perfect square on the left side:
((x) + 5.25)((x) + 5.25) = 30.6125

Calculate the square root of the right side: 5.532856405

Break this problem into two subproblems by setting 
((x) + 5.25) equal to 5.532856405 and -5.532856405.

Subproblem 1

(x) + 5.25 = 5.532856405 Simplifying (x) + 5.25 = 5.532856405 x + 5.25 = 5.532856405 Reorder the terms: 5.25 + x = 5.532856405 Solving 5.25 + x = 5.532856405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + x = 5.532856405 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = 5.532856405 + -5.25 x = 5.532856405 + -5.25 Combine like terms: 5.532856405 + -5.25 = 0.282856405 x = 0.282856405 Simplifying x = 0.282856405

Subproblem 2

(x) + 5.25 = -5.532856405 Simplifying (x) + 5.25 = -5.532856405 x + 5.25 = -5.532856405 Reorder the terms: 5.25 + x = -5.532856405 Solving 5.25 + x = -5.532856405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.25' to each side of the equation. 5.25 + -5.25 + x = -5.532856405 + -5.25 Combine like terms: 5.25 + -5.25 = 0.00 0.00 + x = -5.532856405 + -5.25 x = -5.532856405 + -5.25 Combine like terms: -5.532856405 + -5.25 = -10.782856405 x = -10.782856405 Simplifying x = -10.782856405

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.282856405, -10.782856405}

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