(2+u)(5u+4)=0

Solution for (2+u)(5u+4)=0 equation:

Simplifying
(2 + u)(5u + 4) = 0

Reorder the terms:
(2 + u)(4 + 5u) = 0

Multiply (2 + u) * (4 + 5u)
(2(4 + 5u) + u(4 + 5u)) = 0
((4 * 2 + 5u * 2) + u(4 + 5u)) = 0
((8 + 10u) + u(4 + 5u)) = 0
(8 + 10u + (4 * u + 5u * u)) = 0
(8 + 10u + (4u + 5u2)) = 0

Combine like terms: 10u + 4u = 14u
(8 + 14u + 5u2) = 0

Solving
8 + 14u + 5u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(2 + u)(4 + 5u) = 0

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

Simplifying
2 + u = 0

Solving
2 + u = 0

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

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

Combine like terms: 2 + -2 = 0
0 + u = 0 + -2
u = 0 + -2

Combine like terms: 0 + -2 = -2
u = -2

Simplifying
u = -2
Subproblem 2
Set the factor '(4 + 5u)' equal to zero and attempt to solve:

Simplifying
4 + 5u = 0

Solving
4 + 5u = 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 + 5u = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 5u = 0 + -4
5u = 0 + -4

Combine like terms: 0 + -4 = -4
5u = -4

Divide each side by '5'.
u = -0.8

Simplifying
u = -0.8
Solution
u = {-2, -0.8}