21x^2+50x-50=0

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Solution for 21x^2+50x-50=0 equation:


Simplifying
21x2 + 50x + -50 = 0

Reorder the terms:
-50 + 50x + 21x2 = 0

Solving
-50 + 50x + 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'.
-2.380952381 + 2.380952381x + x2 = 0

Move the constant term to the right:

Add '2.380952381' to each side of the equation.
-2.380952381 + 2.380952381x + 2.380952381 + x2 = 0 + 2.380952381

Reorder the terms:
-2.380952381 + 2.380952381 + 2.380952381x + x2 = 0 + 2.380952381

Combine like terms: -2.380952381 + 2.380952381 = 0.000000000
0.000000000 + 2.380952381x + x2 = 0 + 2.380952381
2.380952381x + x2 = 0 + 2.380952381

Combine like terms: 0 + 2.380952381 = 2.380952381
2.380952381x + x2 = 2.380952381

The x term is 2.380952381x.  Take half its coefficient (1.190476191).
Square it (1.417233561) and add it to both sides.

Add '1.417233561' to each side of the equation.
2.380952381x + 1.417233561 + x2 = 2.380952381 + 1.417233561

Reorder the terms:
1.417233561 + 2.380952381x + x2 = 2.380952381 + 1.417233561

Combine like terms: 2.380952381 + 1.417233561 = 3.798185942
1.417233561 + 2.380952381x + x2 = 3.798185942

Factor a perfect square on the left side:
(x + 1.190476191)(x + 1.190476191) = 3.798185942

Calculate the square root of the right side: 1.948893517

Break this problem into two subproblems by setting 
(x + 1.190476191) equal to 1.948893517 and -1.948893517.

Subproblem 1

x + 1.190476191 = 1.948893517 Simplifying x + 1.190476191 = 1.948893517 Reorder the terms: 1.190476191 + x = 1.948893517 Solving 1.190476191 + x = 1.948893517 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.190476191' to each side of the equation. 1.190476191 + -1.190476191 + x = 1.948893517 + -1.190476191 Combine like terms: 1.190476191 + -1.190476191 = 0.000000000 0.000000000 + x = 1.948893517 + -1.190476191 x = 1.948893517 + -1.190476191 Combine like terms: 1.948893517 + -1.190476191 = 0.758417326 x = 0.758417326 Simplifying x = 0.758417326

Subproblem 2

x + 1.190476191 = -1.948893517 Simplifying x + 1.190476191 = -1.948893517 Reorder the terms: 1.190476191 + x = -1.948893517 Solving 1.190476191 + x = -1.948893517 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.190476191' to each side of the equation. 1.190476191 + -1.190476191 + x = -1.948893517 + -1.190476191 Combine like terms: 1.190476191 + -1.190476191 = 0.000000000 0.000000000 + x = -1.948893517 + -1.190476191 x = -1.948893517 + -1.190476191 Combine like terms: -1.948893517 + -1.190476191 = -3.139369708 x = -3.139369708 Simplifying x = -3.139369708

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.758417326, -3.139369708}

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