(u+7)(u+8)=0

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Solution for (u+7)(u+8)=0 equation: 


Simplifying
(u + 7)(u + 8) = 0

Reorder the terms:
(7 + u)(u + 8) = 0

Reorder the terms:
(7 + u)(8 + u) = 0

Multiply (7 + u) * (8 + u)
(7(8 + u) + u(8 + u)) = 0
((8 * 7 + u * 7) + u(8 + u)) = 0
((56 + 7u) + u(8 + u)) = 0
(56 + 7u + (8 * u + u * u)) = 0
(56 + 7u + (8u + u2)) = 0

Combine like terms: 7u + 8u = 15u
(56 + 15u + u2) = 0

Solving
56 + 15u + u2 = 0

Solving for variable 'u'.

Factor a trinomial.
(8 + u)(7 + u) = 0


Subproblem 1
Set the factor '(8 + u)' equal to zero and attempt to solve:

Simplifying
8 + u = 0

Solving
8 + u = 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 + u = 0 + -8

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

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

Simplifying
u = -8

Subproblem 2
Set the factor '(7 + u)' equal to zero and attempt to solve:

Simplifying
7 + u = 0

Solving
7 + u = 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 + u = 0 + -7

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

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

Simplifying
u = -7
Solution
u = {-8, -7}

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