20y^2+6y-17=0

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


Simplifying
20y2 + 6y + -17 = 0

Reorder the terms:
-17 + 6y + 20y2 = 0

Solving
-17 + 6y + 20y2 = 0

Solving for variable 'y'.

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

Divide each side by '20'.
-0.85 + 0.3y + y2 = 0

Move the constant term to the right:

Add '0.85' to each side of the equation.
-0.85 + 0.3y + 0.85 + y2 = 0 + 0.85

Reorder the terms:
-0.85 + 0.85 + 0.3y + y2 = 0 + 0.85

Combine like terms: -0.85 + 0.85 = 0.00
0.00 + 0.3y + y2 = 0 + 0.85
0.3y + y2 = 0 + 0.85

Combine like terms: 0 + 0.85 = 0.85
0.3y + y2 = 0.85

The y term is 0.3y.  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.
0.3y + 0.0225 + y2 = 0.85 + 0.0225

Reorder the terms:
0.0225 + 0.3y + y2 = 0.85 + 0.0225

Combine like terms: 0.85 + 0.0225 = 0.8725
0.0225 + 0.3y + y2 = 0.8725

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

Calculate the square root of the right side: 0.934077085

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

Subproblem 1

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

Subproblem 2

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

Solution

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

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