0=y^2+9y+20

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Solution for 0=y^2+9y+20 equation:


Simplifying
0 = y2 + 9y + 20

Reorder the terms:
0 = 20 + 9y + y2

Solving
0 = 20 + 9y + y2

Solving for variable 'y'.

Combine like terms: 0 + -20 = -20
-20 + -9y + -1y2 = 20 + 9y + y2 + -20 + -9y + -1y2

Reorder the terms:
-20 + -9y + -1y2 = 20 + -20 + 9y + -9y + y2 + -1y2

Combine like terms: 20 + -20 = 0
-20 + -9y + -1y2 = 0 + 9y + -9y + y2 + -1y2
-20 + -9y + -1y2 = 9y + -9y + y2 + -1y2

Combine like terms: 9y + -9y = 0
-20 + -9y + -1y2 = 0 + y2 + -1y2
-20 + -9y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-20 + -9y + -1y2 = 0

Factor out the Greatest Common Factor (GCF), '-1'.
-1(20 + 9y + y2) = 0

Factor a trinomial.
-1((5 + y)(4 + y)) = 0

Ignore the factor -1.

Subproblem 1

Set the factor '(5 + y)' equal to zero and attempt to solve: Simplifying 5 + y = 0 Solving 5 + y = 0 Move all terms containing y to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + y = 0 + -5 Combine like terms: 5 + -5 = 0 0 + y = 0 + -5 y = 0 + -5 Combine like terms: 0 + -5 = -5 y = -5 Simplifying y = -5

Subproblem 2

Set the factor '(4 + y)' equal to zero and attempt to solve: Simplifying 4 + y = 0 Solving 4 + y = 0 Move all terms containing y to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + y = 0 + -4 Combine like terms: 4 + -4 = 0 0 + y = 0 + -4 y = 0 + -4 Combine like terms: 0 + -4 = -4 y = -4 Simplifying y = -4

Solution

y = {-5, -4}

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