21x^2+110x-3025=0

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Solution for 21x^2+110x-3025=0 equation:


Simplifying
21x2 + 110x + -3025 = 0

Reorder the terms:
-3025 + 110x + 21x2 = 0

Solving
-3025 + 110x + 21x2 = 0

Solving for variable 'x'.

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

Divide each side by '21'.
-144.047619 + 5.238095238x + x2 = 0

Move the constant term to the right:

Add '144.047619' to each side of the equation.
-144.047619 + 5.238095238x + 144.047619 + x2 = 0 + 144.047619

Reorder the terms:
-144.047619 + 144.047619 + 5.238095238x + x2 = 0 + 144.047619

Combine like terms: -144.047619 + 144.047619 = 0.000000
0.000000 + 5.238095238x + x2 = 0 + 144.047619
5.238095238x + x2 = 0 + 144.047619

Combine like terms: 0 + 144.047619 = 144.047619
5.238095238x + x2 = 144.047619

The x term is 5.238095238x.  Take half its coefficient (2.619047619).
Square it (6.859410431) and add it to both sides.

Add '6.859410431' to each side of the equation.
5.238095238x + 6.859410431 + x2 = 144.047619 + 6.859410431

Reorder the terms:
6.859410431 + 5.238095238x + x2 = 144.047619 + 6.859410431

Combine like terms: 144.047619 + 6.859410431 = 150.907029431
6.859410431 + 5.238095238x + x2 = 150.907029431

Factor a perfect square on the left side:
(x + 2.619047619)(x + 2.619047619) = 150.907029431

Calculate the square root of the right side: 12.284422226

Break this problem into two subproblems by setting 
(x + 2.619047619) equal to 12.284422226 and -12.284422226.

Subproblem 1

x + 2.619047619 = 12.284422226 Simplifying x + 2.619047619 = 12.284422226 Reorder the terms: 2.619047619 + x = 12.284422226 Solving 2.619047619 + x = 12.284422226 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.619047619' to each side of the equation. 2.619047619 + -2.619047619 + x = 12.284422226 + -2.619047619 Combine like terms: 2.619047619 + -2.619047619 = 0.000000000 0.000000000 + x = 12.284422226 + -2.619047619 x = 12.284422226 + -2.619047619 Combine like terms: 12.284422226 + -2.619047619 = 9.665374607 x = 9.665374607 Simplifying x = 9.665374607

Subproblem 2

x + 2.619047619 = -12.284422226 Simplifying x + 2.619047619 = -12.284422226 Reorder the terms: 2.619047619 + x = -12.284422226 Solving 2.619047619 + x = -12.284422226 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.619047619' to each side of the equation. 2.619047619 + -2.619047619 + x = -12.284422226 + -2.619047619 Combine like terms: 2.619047619 + -2.619047619 = 0.000000000 0.000000000 + x = -12.284422226 + -2.619047619 x = -12.284422226 + -2.619047619 Combine like terms: -12.284422226 + -2.619047619 = -14.903469845 x = -14.903469845 Simplifying x = -14.903469845

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.665374607, -14.903469845}

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