21x^2-58x+29=0

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Solution for 21x^2-58x+29=0 equation:


Simplifying
21x2 + -58x + 29 = 0

Reorder the terms:
29 + -58x + 21x2 = 0

Solving
29 + -58x + 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'.
1.380952381 + -2.761904762x + x2 = 0

Move the constant term to the right:

Add '-1.380952381' to each side of the equation.
1.380952381 + -2.761904762x + -1.380952381 + x2 = 0 + -1.380952381

Reorder the terms:
1.380952381 + -1.380952381 + -2.761904762x + x2 = 0 + -1.380952381

Combine like terms: 1.380952381 + -1.380952381 = 0.000000000
0.000000000 + -2.761904762x + x2 = 0 + -1.380952381
-2.761904762x + x2 = 0 + -1.380952381

Combine like terms: 0 + -1.380952381 = -1.380952381
-2.761904762x + x2 = -1.380952381

The x term is -2.761904762x.  Take half its coefficient (-1.380952381).
Square it (1.907029479) and add it to both sides.

Add '1.907029479' to each side of the equation.
-2.761904762x + 1.907029479 + x2 = -1.380952381 + 1.907029479

Reorder the terms:
1.907029479 + -2.761904762x + x2 = -1.380952381 + 1.907029479

Combine like terms: -1.380952381 + 1.907029479 = 0.526077098
1.907029479 + -2.761904762x + x2 = 0.526077098

Factor a perfect square on the left side:
(x + -1.380952381)(x + -1.380952381) = 0.526077098

Calculate the square root of the right side: 0.725311725

Break this problem into two subproblems by setting 
(x + -1.380952381) equal to 0.725311725 and -0.725311725.

Subproblem 1

x + -1.380952381 = 0.725311725 Simplifying x + -1.380952381 = 0.725311725 Reorder the terms: -1.380952381 + x = 0.725311725 Solving -1.380952381 + x = 0.725311725 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.380952381' to each side of the equation. -1.380952381 + 1.380952381 + x = 0.725311725 + 1.380952381 Combine like terms: -1.380952381 + 1.380952381 = 0.000000000 0.000000000 + x = 0.725311725 + 1.380952381 x = 0.725311725 + 1.380952381 Combine like terms: 0.725311725 + 1.380952381 = 2.106264106 x = 2.106264106 Simplifying x = 2.106264106

Subproblem 2

x + -1.380952381 = -0.725311725 Simplifying x + -1.380952381 = -0.725311725 Reorder the terms: -1.380952381 + x = -0.725311725 Solving -1.380952381 + x = -0.725311725 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.380952381' to each side of the equation. -1.380952381 + 1.380952381 + x = -0.725311725 + 1.380952381 Combine like terms: -1.380952381 + 1.380952381 = 0.000000000 0.000000000 + x = -0.725311725 + 1.380952381 x = -0.725311725 + 1.380952381 Combine like terms: -0.725311725 + 1.380952381 = 0.655640656 x = 0.655640656 Simplifying x = 0.655640656

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.106264106, 0.655640656}

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