9x^2-79x+136=0

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Solution for 9x^2-79x+136=0 equation:


Simplifying
9x2 + -79x + 136 = 0

Reorder the terms:
136 + -79x + 9x2 = 0

Solving
136 + -79x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
15.11111111 + -8.777777778x + x2 = 0

Move the constant term to the right:

Add '-15.11111111' to each side of the equation.
15.11111111 + -8.777777778x + -15.11111111 + x2 = 0 + -15.11111111

Reorder the terms:
15.11111111 + -15.11111111 + -8.777777778x + x2 = 0 + -15.11111111

Combine like terms: 15.11111111 + -15.11111111 = 0.00000000
0.00000000 + -8.777777778x + x2 = 0 + -15.11111111
-8.777777778x + x2 = 0 + -15.11111111

Combine like terms: 0 + -15.11111111 = -15.11111111
-8.777777778x + x2 = -15.11111111

The x term is -8.777777778x.  Take half its coefficient (-4.388888889).
Square it (19.26234568) and add it to both sides.

Add '19.26234568' to each side of the equation.
-8.777777778x + 19.26234568 + x2 = -15.11111111 + 19.26234568

Reorder the terms:
19.26234568 + -8.777777778x + x2 = -15.11111111 + 19.26234568

Combine like terms: -15.11111111 + 19.26234568 = 4.15123457
19.26234568 + -8.777777778x + x2 = 4.15123457

Factor a perfect square on the left side:
(x + -4.388888889)(x + -4.388888889) = 4.15123457

Calculate the square root of the right side: 2.03745787

Break this problem into two subproblems by setting 
(x + -4.388888889) equal to 2.03745787 and -2.03745787.

Subproblem 1

x + -4.388888889 = 2.03745787 Simplifying x + -4.388888889 = 2.03745787 Reorder the terms: -4.388888889 + x = 2.03745787 Solving -4.388888889 + x = 2.03745787 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.388888889' to each side of the equation. -4.388888889 + 4.388888889 + x = 2.03745787 + 4.388888889 Combine like terms: -4.388888889 + 4.388888889 = 0.000000000 0.000000000 + x = 2.03745787 + 4.388888889 x = 2.03745787 + 4.388888889 Combine like terms: 2.03745787 + 4.388888889 = 6.426346759 x = 6.426346759 Simplifying x = 6.426346759

Subproblem 2

x + -4.388888889 = -2.03745787 Simplifying x + -4.388888889 = -2.03745787 Reorder the terms: -4.388888889 + x = -2.03745787 Solving -4.388888889 + x = -2.03745787 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.388888889' to each side of the equation. -4.388888889 + 4.388888889 + x = -2.03745787 + 4.388888889 Combine like terms: -4.388888889 + 4.388888889 = 0.000000000 0.000000000 + x = -2.03745787 + 4.388888889 x = -2.03745787 + 4.388888889 Combine like terms: -2.03745787 + 4.388888889 = 2.351431019 x = 2.351431019 Simplifying x = 2.351431019

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.426346759, 2.351431019}

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