9x^2-79x+116=0

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Solution for 9x^2-79x+116=0 equation:


Simplifying
9x2 + -79x + 116 = 0

Reorder the terms:
116 + -79x + 9x2 = 0

Solving
116 + -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'.
12.88888889 + -8.777777778x + x2 = 0

Move the constant term to the right:

Add '-12.88888889' to each side of the equation.
12.88888889 + -8.777777778x + -12.88888889 + x2 = 0 + -12.88888889

Reorder the terms:
12.88888889 + -12.88888889 + -8.777777778x + x2 = 0 + -12.88888889

Combine like terms: 12.88888889 + -12.88888889 = 0.00000000
0.00000000 + -8.777777778x + x2 = 0 + -12.88888889
-8.777777778x + x2 = 0 + -12.88888889

Combine like terms: 0 + -12.88888889 = -12.88888889
-8.777777778x + x2 = -12.88888889

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 = -12.88888889 + 19.26234568

Reorder the terms:
19.26234568 + -8.777777778x + x2 = -12.88888889 + 19.26234568

Combine like terms: -12.88888889 + 19.26234568 = 6.37345679
19.26234568 + -8.777777778x + x2 = 6.37345679

Factor a perfect square on the left side:
(x + -4.388888889)(x + -4.388888889) = 6.37345679

Calculate the square root of the right side: 2.524570615

Break this problem into two subproblems by setting 
(x + -4.388888889) equal to 2.524570615 and -2.524570615.

Subproblem 1

x + -4.388888889 = 2.524570615 Simplifying x + -4.388888889 = 2.524570615 Reorder the terms: -4.388888889 + x = 2.524570615 Solving -4.388888889 + x = 2.524570615 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 = 2.524570615 + 4.388888889 Combine like terms: -4.388888889 + 4.388888889 = 0.000000000 0.000000000 + x = 2.524570615 + 4.388888889 x = 2.524570615 + 4.388888889 Combine like terms: 2.524570615 + 4.388888889 = 6.913459504 x = 6.913459504 Simplifying x = 6.913459504

Subproblem 2

x + -4.388888889 = -2.524570615 Simplifying x + -4.388888889 = -2.524570615 Reorder the terms: -4.388888889 + x = -2.524570615 Solving -4.388888889 + x = -2.524570615 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 = -2.524570615 + 4.388888889 Combine like terms: -4.388888889 + 4.388888889 = 0.000000000 0.000000000 + x = -2.524570615 + 4.388888889 x = -2.524570615 + 4.388888889 Combine like terms: -2.524570615 + 4.388888889 = 1.864318274 x = 1.864318274 Simplifying x = 1.864318274

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.913459504, 1.864318274}

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