(4-u)(5u+8)=0

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Solution for (4-u)(5u+8)=0 equation: 


Simplifying
(4 + -1u)(5u + 8) = 0

Reorder the terms:
(4 + -1u)(8 + 5u) = 0

Multiply (4 + -1u) * (8 + 5u)
(4(8 + 5u) + -1u * (8 + 5u)) = 0
((8 * 4 + 5u * 4) + -1u * (8 + 5u)) = 0
((32 + 20u) + -1u * (8 + 5u)) = 0
(32 + 20u + (8 * -1u + 5u * -1u)) = 0
(32 + 20u + (-8u + -5u2)) = 0

Combine like terms: 20u + -8u = 12u
(32 + 12u + -5u2) = 0

Solving
32 + 12u + -5u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(4 + -1u)(8 + 5u) = 0


Subproblem 1
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

Subproblem 2
Set the factor '(8 + 5u)' equal to zero and attempt to solve:

Simplifying
8 + 5u = 0

Solving
8 + 5u = 0

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

Add '-8' to each side of the equation.
8 + -8 + 5u = 0 + -8

Combine like terms: 8 + -8 = 0
0 + 5u = 0 + -8
5u = 0 + -8

Combine like terms: 0 + -8 = -8
5u = -8

Divide each side by '5'.
u = -1.6

Simplifying
u = -1.6
Solution
u = {4, -1.6}

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