y^2+9y=-20

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


Simplifying
y2 + 9y = -20

Reorder the terms:
9y + y2 = -20

Solving
9y + y2 = -20

Solving for variable 'y'.

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

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

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

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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