y^2+15y-54=0

Solution for y^2+15y-54=0 equation:

Simplifying
y2 + 15y + -54 = 0

Reorder the terms:
-54 + 15y + y2 = 0

Solving
-54 + 15y + y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(-18 + -1y)(3 + -1y) = 0

Subproblem 1
Set the factor '(-18 + -1y)' equal to zero and attempt to solve:

Simplifying
-18 + -1y = 0

Solving
-18 + -1y = 0

Move all terms containing y to the left, all other terms to the right.

Add '18' to each side of the equation.
-18 + 18 + -1y = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -1y = 0 + 18
-1y = 0 + 18

Combine like terms: 0 + 18 = 18
-1y = 18

Divide each side by '-1'.
y = -18

Simplifying
y = -18
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 = {-18, 3}