h^2-8h-9=0

Solution for h^2-8h-9=0 equation:

Simplifying
h2 + -8h + -9 = 0

Reorder the terms:
-9 + -8h + h2 = 0

Solving
-9 + -8h + h2 = 0

Solving for variable 'h'.

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

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

Simplifying
-1 + -1h = 0

Solving
-1 + -1h = 0

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

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

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

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

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

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

Simplifying
9 + -1h = 0

Solving
9 + -1h = 0

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

Add '-9' to each side of the equation.
9 + -9 + -1h = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1h = 0 + -9
-1h = 0 + -9

Combine like terms: 0 + -9 = -9
-1h = -9

Divide each side by '-1'.
h = 9

Simplifying
h = 9
Solution
h = {-1, 9}