u^2+8u-20=0

Solution for u^2+8u-20=0 equation:

Simplifying
u2 + 8u + -20 = 0

Reorder the terms:
-20 + 8u + u2 = 0

Solving
-20 + 8u + u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(-10 + -1u)(2 + -1u) = 0

Subproblem 1
Set the factor '(-10 + -1u)' equal to zero and attempt to solve:

Simplifying
-10 + -1u = 0

Solving
-10 + -1u = 0

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

Add '10' to each side of the equation.
-10 + 10 + -1u = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -1u = 0 + 10
-1u = 0 + 10

Combine like terms: 0 + 10 = 10
-1u = 10

Divide each side by '-1'.
u = -10

Simplifying
u = -10
Subproblem 2
Set the factor '(2 + -1u)' equal to zero and attempt to solve:

Simplifying
2 + -1u = 0

Solving
2 + -1u = 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 + -1u = 0 + -2

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

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

Divide each side by '-1'.
u = 2

Simplifying
u = 2
Solution
u = {-10, 2}