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

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


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

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

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

Multiply (8 + x) * (5 + 4x)
(8(5 + 4x) + x(5 + 4x)) = 0
((5 * 8 + 4x * 8) + x(5 + 4x)) = 0
((40 + 32x) + x(5 + 4x)) = 0
(40 + 32x + (5 * x + 4x * x)) = 0
(40 + 32x + (5x + 4x2)) = 0

Combine like terms: 32x + 5x = 37x
(40 + 37x + 4x2) = 0

Solving
40 + 37x + 4x2 = 0

Solving for variable 'x'.

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


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

Simplifying
8 + x = 0

Solving
8 + x = 0

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

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

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

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

Simplifying
x = -8

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

Simplifying
5 + 4x = 0

Solving
5 + 4x = 0

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

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

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

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

Divide each side by '4'.
x = -1.25

Simplifying
x = -1.25
Solution
x = {-8, -1.25}

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