y^2+17y+20=0

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


Simplifying
y2 + 17y + 20 = 0

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

Solving
20 + 17y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + 17y + -20 + y2 = 0 + -20

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

Combine like terms: 20 + -20 = 0
0 + 17y + y2 = 0 + -20
17y + y2 = 0 + -20

Combine like terms: 0 + -20 = -20
17y + y2 = -20

The y term is 17y.  Take half its coefficient (8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
17y + 72.25 + y2 = -20 + 72.25

Reorder the terms:
72.25 + 17y + y2 = -20 + 72.25

Combine like terms: -20 + 72.25 = 52.25
72.25 + 17y + y2 = 52.25

Factor a perfect square on the left side:
(y + 8.5)(y + 8.5) = 52.25

Calculate the square root of the right side: 7.228416147

Break this problem into two subproblems by setting 
(y + 8.5) equal to 7.228416147 and -7.228416147.

Subproblem 1

y + 8.5 = 7.228416147 Simplifying y + 8.5 = 7.228416147 Reorder the terms: 8.5 + y = 7.228416147 Solving 8.5 + y = 7.228416147 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + y = 7.228416147 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + y = 7.228416147 + -8.5 y = 7.228416147 + -8.5 Combine like terms: 7.228416147 + -8.5 = -1.271583853 y = -1.271583853 Simplifying y = -1.271583853

Subproblem 2

y + 8.5 = -7.228416147 Simplifying y + 8.5 = -7.228416147 Reorder the terms: 8.5 + y = -7.228416147 Solving 8.5 + y = -7.228416147 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + y = -7.228416147 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + y = -7.228416147 + -8.5 y = -7.228416147 + -8.5 Combine like terms: -7.228416147 + -8.5 = -15.728416147 y = -15.728416147 Simplifying y = -15.728416147

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-1.271583853, -15.728416147}

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