20x^2-6x-17=0

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Solution for 20x^2-6x-17=0 equation:


Simplifying
20x2 + -6x + -17 = 0

Reorder the terms:
-17 + -6x + 20x2 = 0

Solving
-17 + -6x + 20x2 = 0

Solving for variable 'x'.

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

Divide each side by '20'.
-0.85 + -0.3x + x2 = 0

Move the constant term to the right:

Add '0.85' to each side of the equation.
-0.85 + -0.3x + 0.85 + x2 = 0 + 0.85

Reorder the terms:
-0.85 + 0.85 + -0.3x + x2 = 0 + 0.85

Combine like terms: -0.85 + 0.85 = 0.00
0.00 + -0.3x + x2 = 0 + 0.85
-0.3x + x2 = 0 + 0.85

Combine like terms: 0 + 0.85 = 0.85
-0.3x + x2 = 0.85

The x term is -0.3x.  Take half its coefficient (-0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
-0.3x + 0.0225 + x2 = 0.85 + 0.0225

Reorder the terms:
0.0225 + -0.3x + x2 = 0.85 + 0.0225

Combine like terms: 0.85 + 0.0225 = 0.8725
0.0225 + -0.3x + x2 = 0.8725

Factor a perfect square on the left side:
(x + -0.15)(x + -0.15) = 0.8725

Calculate the square root of the right side: 0.934077085

Break this problem into two subproblems by setting 
(x + -0.15) equal to 0.934077085 and -0.934077085.

Subproblem 1

x + -0.15 = 0.934077085 Simplifying x + -0.15 = 0.934077085 Reorder the terms: -0.15 + x = 0.934077085 Solving -0.15 + x = 0.934077085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = 0.934077085 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = 0.934077085 + 0.15 x = 0.934077085 + 0.15 Combine like terms: 0.934077085 + 0.15 = 1.084077085 x = 1.084077085 Simplifying x = 1.084077085

Subproblem 2

x + -0.15 = -0.934077085 Simplifying x + -0.15 = -0.934077085 Reorder the terms: -0.15 + x = -0.934077085 Solving -0.15 + x = -0.934077085 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = -0.934077085 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = -0.934077085 + 0.15 x = -0.934077085 + 0.15 Combine like terms: -0.934077085 + 0.15 = -0.784077085 x = -0.784077085 Simplifying x = -0.784077085

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.084077085, -0.784077085}

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