(s+11)(s-9)=

Solution for (s+11)(s-9)= equation:

Simplifying
(s + 11)(s + -9) = 0

Reorder the terms:
(11 + s)(s + -9) = 0

Reorder the terms:
(11 + s)(-9 + s) = 0

Multiply (11 + s) * (-9 + s)
(11(-9 + s) + s(-9 + s)) = 0
((-9 * 11 + s * 11) + s(-9 + s)) = 0
((-99 + 11s) + s(-9 + s)) = 0
(-99 + 11s + (-9 * s + s * s)) = 0
(-99 + 11s + (-9s + s2)) = 0

Combine like terms: 11s + -9s = 2s
(-99 + 2s + s2) = 0

Solving
-99 + 2s + s2 = 0

Solving for variable 's'.

Factor a trinomial.
(-11 + -1s)(9 + -1s) = 0

Subproblem 1
Set the factor '(-11 + -1s)' equal to zero and attempt to solve:

Simplifying
-11 + -1s = 0

Solving
-11 + -1s = 0

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

Add '11' to each side of the equation.
-11 + 11 + -1s = 0 + 11

Combine like terms: -11 + 11 = 0
0 + -1s = 0 + 11
-1s = 0 + 11

Combine like terms: 0 + 11 = 11
-1s = 11

Divide each side by '-1'.
s = -11

Simplifying
s = -11
Subproblem 2
Set the factor '(9 + -1s)' equal to zero and attempt to solve:

Simplifying
9 + -1s = 0

Solving
9 + -1s = 0

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

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

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

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

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

Simplifying
s = 9
Solution
s = {-11, 9}