5y^2-4y-28=0

Solution for 5y^2-4y-28=0 equation:

Simplifying
5y2 + -4y + -28 = 0

Reorder the terms:
-28 + -4y + 5y2 = 0

Solving
-28 + -4y + 5y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(-2 + -1y)(14 + -5y) = 0

Subproblem 1
Set the factor '(-2 + -1y)' equal to zero and attempt to solve:

Simplifying
-2 + -1y = 0

Solving
-2 + -1y = 0

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

Add '2' to each side of the equation.
-2 + 2 + -1y = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1y = 0 + 2
-1y = 0 + 2

Combine like terms: 0 + 2 = 2
-1y = 2

Divide each side by '-1'.
y = -2

Simplifying
y = -2
Subproblem 2
Set the factor '(14 + -5y)' equal to zero and attempt to solve:

Simplifying
14 + -5y = 0

Solving
14 + -5y = 0

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

Add '-14' to each side of the equation.
14 + -14 + -5y = 0 + -14

Combine like terms: 14 + -14 = 0
0 + -5y = 0 + -14
-5y = 0 + -14

Combine like terms: 0 + -14 = -14
-5y = -14

Divide each side by '-5'.
y = 2.8

Simplifying
y = 2.8
Solution
y = {-2, 2.8}