(6+u)(3u-7)=0

Solution for (6+u)(3u-7)=0 equation:

Simplifying
(6 + u)(3u + -7) = 0

Reorder the terms:
(6 + u)(-7 + 3u) = 0

Multiply (6 + u) * (-7 + 3u)
(6(-7 + 3u) + u(-7 + 3u)) = 0
((-7 * 6 + 3u * 6) + u(-7 + 3u)) = 0
((-42 + 18u) + u(-7 + 3u)) = 0
(-42 + 18u + (-7 * u + 3u * u)) = 0
(-42 + 18u + (-7u + 3u2)) = 0

Combine like terms: 18u + -7u = 11u
(-42 + 11u + 3u2) = 0

Solving
-42 + 11u + 3u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(-6 + -1u)(7 + -3u) = 0

Subproblem 1
Set the factor '(-6 + -1u)' equal to zero and attempt to solve:

Simplifying
-6 + -1u = 0

Solving
-6 + -1u = 0

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

Add '6' to each side of the equation.
-6 + 6 + -1u = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -1u = 0 + 6
-1u = 0 + 6

Combine like terms: 0 + 6 = 6
-1u = 6

Divide each side by '-1'.
u = -6

Simplifying
u = -6
Subproblem 2
Set the factor '(7 + -3u)' equal to zero and attempt to solve:

Simplifying
7 + -3u = 0

Solving
7 + -3u = 0

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

Add '-7' to each side of the equation.
7 + -7 + -3u = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -3u = 0 + -7
-3u = 0 + -7

Combine like terms: 0 + -7 = -7
-3u = -7

Divide each side by '-3'.
u = 2.333333333

Simplifying
u = 2.333333333
Solution
u = {-6, 2.333333333}