5x^2-11x-17=0

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Solution for 5x^2-11x-17=0 equation:


Simplifying
5x2 + -11x + -17 = 0

Reorder the terms:
-17 + -11x + 5x2 = 0

Solving
-17 + -11x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-3.4 + -2.2x + x2 = 0

Move the constant term to the right:

Add '3.4' to each side of the equation.
-3.4 + -2.2x + 3.4 + x2 = 0 + 3.4

Reorder the terms:
-3.4 + 3.4 + -2.2x + x2 = 0 + 3.4

Combine like terms: -3.4 + 3.4 = 0.0
0.0 + -2.2x + x2 = 0 + 3.4
-2.2x + x2 = 0 + 3.4

Combine like terms: 0 + 3.4 = 3.4
-2.2x + x2 = 3.4

The x term is -2.2x.  Take half its coefficient (-1.1).
Square it (1.21) and add it to both sides.

Add '1.21' to each side of the equation.
-2.2x + 1.21 + x2 = 3.4 + 1.21

Reorder the terms:
1.21 + -2.2x + x2 = 3.4 + 1.21

Combine like terms: 3.4 + 1.21 = 4.61
1.21 + -2.2x + x2 = 4.61

Factor a perfect square on the left side:
(x + -1.1)(x + -1.1) = 4.61

Calculate the square root of the right side: 2.147091055

Break this problem into two subproblems by setting 
(x + -1.1) equal to 2.147091055 and -2.147091055.

Subproblem 1

x + -1.1 = 2.147091055 Simplifying x + -1.1 = 2.147091055 Reorder the terms: -1.1 + x = 2.147091055 Solving -1.1 + x = 2.147091055 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.1' to each side of the equation. -1.1 + 1.1 + x = 2.147091055 + 1.1 Combine like terms: -1.1 + 1.1 = 0.0 0.0 + x = 2.147091055 + 1.1 x = 2.147091055 + 1.1 Combine like terms: 2.147091055 + 1.1 = 3.247091055 x = 3.247091055 Simplifying x = 3.247091055

Subproblem 2

x + -1.1 = -2.147091055 Simplifying x + -1.1 = -2.147091055 Reorder the terms: -1.1 + x = -2.147091055 Solving -1.1 + x = -2.147091055 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.1' to each side of the equation. -1.1 + 1.1 + x = -2.147091055 + 1.1 Combine like terms: -1.1 + 1.1 = 0.0 0.0 + x = -2.147091055 + 1.1 x = -2.147091055 + 1.1 Combine like terms: -2.147091055 + 1.1 = -1.047091055 x = -1.047091055 Simplifying x = -1.047091055

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.247091055, -1.047091055}

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