3x^2+17x-9=0

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Solution for 3x^2+17x-9=0 equation:


Simplifying
3x2 + 17x + -9 = 0

Reorder the terms:
-9 + 17x + 3x2 = 0

Solving
-9 + 17x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-3 + 5.666666667x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 5.666666667x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 5.666666667x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 5.666666667x + x2 = 0 + 3
5.666666667x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
5.666666667x + x2 = 3

The x term is 5.666666667x.  Take half its coefficient (2.833333334).
Square it (8.027777782) and add it to both sides.

Add '8.027777782' to each side of the equation.
5.666666667x + 8.027777782 + x2 = 3 + 8.027777782

Reorder the terms:
8.027777782 + 5.666666667x + x2 = 3 + 8.027777782

Combine like terms: 3 + 8.027777782 = 11.027777782
8.027777782 + 5.666666667x + x2 = 11.027777782

Factor a perfect square on the left side:
(x + 2.833333334)(x + 2.833333334) = 11.027777782

Calculate the square root of the right side: 3.320809808

Break this problem into two subproblems by setting 
(x + 2.833333334) equal to 3.320809808 and -3.320809808.

Subproblem 1

x + 2.833333334 = 3.320809808 Simplifying x + 2.833333334 = 3.320809808 Reorder the terms: 2.833333334 + x = 3.320809808 Solving 2.833333334 + x = 3.320809808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.833333334' to each side of the equation. 2.833333334 + -2.833333334 + x = 3.320809808 + -2.833333334 Combine like terms: 2.833333334 + -2.833333334 = 0.000000000 0.000000000 + x = 3.320809808 + -2.833333334 x = 3.320809808 + -2.833333334 Combine like terms: 3.320809808 + -2.833333334 = 0.487476474 x = 0.487476474 Simplifying x = 0.487476474

Subproblem 2

x + 2.833333334 = -3.320809808 Simplifying x + 2.833333334 = -3.320809808 Reorder the terms: 2.833333334 + x = -3.320809808 Solving 2.833333334 + x = -3.320809808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.833333334' to each side of the equation. 2.833333334 + -2.833333334 + x = -3.320809808 + -2.833333334 Combine like terms: 2.833333334 + -2.833333334 = 0.000000000 0.000000000 + x = -3.320809808 + -2.833333334 x = -3.320809808 + -2.833333334 Combine like terms: -3.320809808 + -2.833333334 = -6.154143142 x = -6.154143142 Simplifying x = -6.154143142

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.487476474, -6.154143142}

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