2u^2+u-11-u^2-2u-1=0

Solution for 2u^2+u-11-u^2-2u-1=0 equation:

Simplifying
2u2 + u + -11 + -1u2 + -2u + -1 = 0

Reorder the terms:
-11 + -1 + u + -2u + 2u2 + -1u2 = 0

Combine like terms: -11 + -1 = -12
-12 + u + -2u + 2u2 + -1u2 = 0

Combine like terms: u + -2u = -1u
-12 + -1u + 2u2 + -1u2 = 0

Combine like terms: 2u2 + -1u2 = 1u2
-12 + -1u + 1u2 = 0

Solving
-12 + -1u + 1u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(-3 + -1u)(4 + -1u) = 0

Subproblem 1
Set the factor '(-3 + -1u)' equal to zero and attempt to solve:

Simplifying
-3 + -1u = 0

Solving
-3 + -1u = 0

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

Add '3' to each side of the equation.
-3 + 3 + -1u = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1u = 0 + 3
-1u = 0 + 3

Combine like terms: 0 + 3 = 3
-1u = 3

Divide each side by '-1'.
u = -3

Simplifying
u = -3
Subproblem 2
Set the factor '(4 + -1u)' equal to zero and attempt to solve:

Simplifying
4 + -1u = 0

Solving
4 + -1u = 0

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

Add '-4' to each side of the equation.
4 + -4 + -1u = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1u = 0 + -4
-1u = 0 + -4

Combine like terms: 0 + -4 = -4
-1u = -4

Divide each side by '-1'.
u = 4

Simplifying
u = 4
Solution
u = {-3, 4}