9x^2+17x-55=9

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Solution for 9x^2+17x-55=9 equation:


Simplifying
9x2 + 17x + -55 = 9

Reorder the terms:
-55 + 17x + 9x2 = 9

Solving
-55 + 17x + 9x2 = 9

Solving for variable 'x'.

Reorder the terms:
-55 + -9 + 17x + 9x2 = 9 + -9

Combine like terms: -55 + -9 = -64
-64 + 17x + 9x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-64 + 17x + 9x2 = 0

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

Divide each side by '9'.
-7.111111111 + 1.888888889x + x2 = 0

Move the constant term to the right:

Add '7.111111111' to each side of the equation.
-7.111111111 + 1.888888889x + 7.111111111 + x2 = 0 + 7.111111111

Reorder the terms:
-7.111111111 + 7.111111111 + 1.888888889x + x2 = 0 + 7.111111111

Combine like terms: -7.111111111 + 7.111111111 = 0.000000000
0.000000000 + 1.888888889x + x2 = 0 + 7.111111111
1.888888889x + x2 = 0 + 7.111111111

Combine like terms: 0 + 7.111111111 = 7.111111111
1.888888889x + x2 = 7.111111111

The x term is 1.888888889x.  Take half its coefficient (0.9444444445).
Square it (0.8919753087) and add it to both sides.

Add '0.8919753087' to each side of the equation.
1.888888889x + 0.8919753087 + x2 = 7.111111111 + 0.8919753087

Reorder the terms:
0.8919753087 + 1.888888889x + x2 = 7.111111111 + 0.8919753087

Combine like terms: 7.111111111 + 0.8919753087 = 8.0030864197
0.8919753087 + 1.888888889x + x2 = 8.0030864197

Factor a perfect square on the left side:
(x + 0.9444444445)(x + 0.9444444445) = 8.0030864197

Calculate the square root of the right side: 2.828972679

Break this problem into two subproblems by setting 
(x + 0.9444444445) equal to 2.828972679 and -2.828972679.

Subproblem 1

x + 0.9444444445 = 2.828972679 Simplifying x + 0.9444444445 = 2.828972679 Reorder the terms: 0.9444444445 + x = 2.828972679 Solving 0.9444444445 + x = 2.828972679 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9444444445' to each side of the equation. 0.9444444445 + -0.9444444445 + x = 2.828972679 + -0.9444444445 Combine like terms: 0.9444444445 + -0.9444444445 = 0.0000000000 0.0000000000 + x = 2.828972679 + -0.9444444445 x = 2.828972679 + -0.9444444445 Combine like terms: 2.828972679 + -0.9444444445 = 1.8845282345 x = 1.8845282345 Simplifying x = 1.8845282345

Subproblem 2

x + 0.9444444445 = -2.828972679 Simplifying x + 0.9444444445 = -2.828972679 Reorder the terms: 0.9444444445 + x = -2.828972679 Solving 0.9444444445 + x = -2.828972679 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9444444445' to each side of the equation. 0.9444444445 + -0.9444444445 + x = -2.828972679 + -0.9444444445 Combine like terms: 0.9444444445 + -0.9444444445 = 0.0000000000 0.0000000000 + x = -2.828972679 + -0.9444444445 x = -2.828972679 + -0.9444444445 Combine like terms: -2.828972679 + -0.9444444445 = -3.7734171235 x = -3.7734171235 Simplifying x = -3.7734171235

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.8845282345, -3.7734171235}

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