y^2-9=6y-18

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Solution for y^2-9=6y-18 equation:


Simplifying
y2 + -9 = 6y + -18

Reorder the terms:
-9 + y2 = 6y + -18

Reorder the terms:
-9 + y2 = -18 + 6y

Solving
-9 + y2 = -18 + 6y

Solving for variable 'y'.

Reorder the terms:
-9 + 18 + -6y + y2 = -18 + 6y + 18 + -6y

Combine like terms: -9 + 18 = 9
9 + -6y + y2 = -18 + 6y + 18 + -6y

Reorder the terms:
9 + -6y + y2 = -18 + 18 + 6y + -6y

Combine like terms: -18 + 18 = 0
9 + -6y + y2 = 0 + 6y + -6y
9 + -6y + y2 = 6y + -6y

Combine like terms: 6y + -6y = 0
9 + -6y + y2 = 0

Factor a trinomial.
(3 + -1y)(3 + -1y) = 0

Subproblem 1

Set the factor '(3 + -1y)' equal to zero and attempt to solve: Simplifying 3 + -1y = 0 Solving 3 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1y = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1y = 0 + -3 -1y = 0 + -3 Combine like terms: 0 + -3 = -3 -1y = -3 Divide each side by '-1'. y = 3 Simplifying y = 3

Subproblem 2

Set the factor '(3 + -1y)' equal to zero and attempt to solve: Simplifying 3 + -1y = 0 Solving 3 + -1y = 0 Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1y = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1y = 0 + -3 -1y = 0 + -3 Combine like terms: 0 + -3 = -3 -1y = -3 Divide each side by '-1'. y = 3 Simplifying y = 3

Solution

y = {3, 3}

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