9x^2=30x-17

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Solution for 9x^2=30x-17 equation:


Simplifying
9x2 = 30x + -17

Reorder the terms:
9x2 = -17 + 30x

Solving
9x2 = -17 + 30x

Solving for variable 'x'.

Reorder the terms:
17 + -30x + 9x2 = -17 + 30x + 17 + -30x

Reorder the terms:
17 + -30x + 9x2 = -17 + 17 + 30x + -30x

Combine like terms: -17 + 17 = 0
17 + -30x + 9x2 = 0 + 30x + -30x
17 + -30x + 9x2 = 30x + -30x

Combine like terms: 30x + -30x = 0
17 + -30x + 9x2 = 0

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

Divide each side by '9'.
1.888888889 + -3.333333333x + x2 = 0

Move the constant term to the right:

Add '-1.888888889' to each side of the equation.
1.888888889 + -3.333333333x + -1.888888889 + x2 = 0 + -1.888888889

Reorder the terms:
1.888888889 + -1.888888889 + -3.333333333x + x2 = 0 + -1.888888889

Combine like terms: 1.888888889 + -1.888888889 = 0.000000000
0.000000000 + -3.333333333x + x2 = 0 + -1.888888889
-3.333333333x + x2 = 0 + -1.888888889

Combine like terms: 0 + -1.888888889 = -1.888888889
-3.333333333x + x2 = -1.888888889

The x term is -3.333333333x.  Take half its coefficient (-1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
-3.333333333x + 2.777777779 + x2 = -1.888888889 + 2.777777779

Reorder the terms:
2.777777779 + -3.333333333x + x2 = -1.888888889 + 2.777777779

Combine like terms: -1.888888889 + 2.777777779 = 0.88888889
2.777777779 + -3.333333333x + x2 = 0.88888889

Factor a perfect square on the left side:
(x + -1.666666667)(x + -1.666666667) = 0.88888889

Calculate the square root of the right side: 0.942809042

Break this problem into two subproblems by setting 
(x + -1.666666667) equal to 0.942809042 and -0.942809042.

Subproblem 1

x + -1.666666667 = 0.942809042 Simplifying x + -1.666666667 = 0.942809042 Reorder the terms: -1.666666667 + x = 0.942809042 Solving -1.666666667 + x = 0.942809042 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x = 0.942809042 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x = 0.942809042 + 1.666666667 x = 0.942809042 + 1.666666667 Combine like terms: 0.942809042 + 1.666666667 = 2.609475709 x = 2.609475709 Simplifying x = 2.609475709

Subproblem 2

x + -1.666666667 = -0.942809042 Simplifying x + -1.666666667 = -0.942809042 Reorder the terms: -1.666666667 + x = -0.942809042 Solving -1.666666667 + x = -0.942809042 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x = -0.942809042 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x = -0.942809042 + 1.666666667 x = -0.942809042 + 1.666666667 Combine like terms: -0.942809042 + 1.666666667 = 0.723857625 x = 0.723857625 Simplifying x = 0.723857625

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.609475709, 0.723857625}

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