9y^2-7y-16=0

Solution for 9y^2-7y-16=0 equation:

Simplifying
9y2 + -7y + -16 = 0

Reorder the terms:
-16 + -7y + 9y2 = 0

Solving
-16 + -7y + 9y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(-1 + -1y)(16 + -9y) = 0

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

Simplifying
-1 + -1y = 0

Solving
-1 + -1y = 0

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

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

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

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

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

Simplifying
y = -1
Subproblem 2
Set the factor '(16 + -9y)' equal to zero and attempt to solve:

Simplifying
16 + -9y = 0

Solving
16 + -9y = 0

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

Add '-16' to each side of the equation.
16 + -16 + -9y = 0 + -16

Combine like terms: 16 + -16 = 0
0 + -9y = 0 + -16
-9y = 0 + -16

Combine like terms: 0 + -16 = -16
-9y = -16

Divide each side by '-9'.
y = 1.777777778

Simplifying
y = 1.777777778
Solution
y = {-1, 1.777777778}