(5y+4)(8+y)=0

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


Simplifying
(5y + 4)(8 + y) = 0

Reorder the terms:
(4 + 5y)(8 + y) = 0

Multiply (4 + 5y) * (8 + y)
(4(8 + y) + 5y * (8 + y)) = 0
((8 * 4 + y * 4) + 5y * (8 + y)) = 0
((32 + 4y) + 5y * (8 + y)) = 0
(32 + 4y + (8 * 5y + y * 5y)) = 0
(32 + 4y + (40y + 5y2)) = 0

Combine like terms: 4y + 40y = 44y
(32 + 44y + 5y2) = 0

Solving
32 + 44y + 5y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(8 + y)(4 + 5y) = 0


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

Simplifying
8 + y = 0

Solving
8 + y = 0

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

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

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

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

Simplifying
y = -8

Subproblem 2
Set the factor '(4 + 5y)' equal to zero and attempt to solve:

Simplifying
4 + 5y = 0

Solving
4 + 5y = 0

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

Add '-4' to each side of the equation.
4 + -4 + 5y = 0 + -4

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

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

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

Simplifying
y = -0.8
Solution
y = {-8, -0.8}

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