9x^2+47x-18=0

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Solution for 9x^2+47x-18=0 equation:


Simplifying
9x2 + 47x + -18 = 0

Reorder the terms:
-18 + 47x + 9x2 = 0

Solving
-18 + 47x + 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'.
-2 + 5.222222222x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 5.222222222x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 5.222222222x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 5.222222222x + x2 = 0 + 2
5.222222222x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
5.222222222x + x2 = 2

The x term is 5.222222222x.  Take half its coefficient (2.611111111).
Square it (6.817901234) and add it to both sides.

Add '6.817901234' to each side of the equation.
5.222222222x + 6.817901234 + x2 = 2 + 6.817901234

Reorder the terms:
6.817901234 + 5.222222222x + x2 = 2 + 6.817901234

Combine like terms: 2 + 6.817901234 = 8.817901234
6.817901234 + 5.222222222x + x2 = 8.817901234

Factor a perfect square on the left side:
(x + 2.611111111)(x + 2.611111111) = 8.817901234

Calculate the square root of the right side: 2.969495114

Break this problem into two subproblems by setting 
(x + 2.611111111) equal to 2.969495114 and -2.969495114.

Subproblem 1

x + 2.611111111 = 2.969495114 Simplifying x + 2.611111111 = 2.969495114 Reorder the terms: 2.611111111 + x = 2.969495114 Solving 2.611111111 + x = 2.969495114 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.611111111' to each side of the equation. 2.611111111 + -2.611111111 + x = 2.969495114 + -2.611111111 Combine like terms: 2.611111111 + -2.611111111 = 0.000000000 0.000000000 + x = 2.969495114 + -2.611111111 x = 2.969495114 + -2.611111111 Combine like terms: 2.969495114 + -2.611111111 = 0.358384003 x = 0.358384003 Simplifying x = 0.358384003

Subproblem 2

x + 2.611111111 = -2.969495114 Simplifying x + 2.611111111 = -2.969495114 Reorder the terms: 2.611111111 + x = -2.969495114 Solving 2.611111111 + x = -2.969495114 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.611111111' to each side of the equation. 2.611111111 + -2.611111111 + x = -2.969495114 + -2.611111111 Combine like terms: 2.611111111 + -2.611111111 = 0.000000000 0.000000000 + x = -2.969495114 + -2.611111111 x = -2.969495114 + -2.611111111 Combine like terms: -2.969495114 + -2.611111111 = -5.580606225 x = -5.580606225 Simplifying x = -5.580606225

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.358384003, -5.580606225}

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