(5x+9)(2x-8)=0

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Solution for (5x+9)(2x-8)=0 equation: 


Simplifying
(5x + 9)(2x + -8) = 0

Reorder the terms:
(9 + 5x)(2x + -8) = 0

Reorder the terms:
(9 + 5x)(-8 + 2x) = 0

Multiply (9 + 5x) * (-8 + 2x)
(9(-8 + 2x) + 5x * (-8 + 2x)) = 0
((-8 * 9 + 2x * 9) + 5x * (-8 + 2x)) = 0
((-72 + 18x) + 5x * (-8 + 2x)) = 0
(-72 + 18x + (-8 * 5x + 2x * 5x)) = 0
(-72 + 18x + (-40x + 10x2)) = 0

Combine like terms: 18x + -40x = -22x
(-72 + -22x + 10x2) = 0

Solving
-72 + -22x + 10x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-36 + -11x + 5x2) = 0

Factor a trinomial.
2((-9 + -5x)(4 + -1x)) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(-9 + -5x)' equal to zero and attempt to solve:

Simplifying
-9 + -5x = 0

Solving
-9 + -5x = 0

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

Add '9' to each side of the equation.
-9 + 9 + -5x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -5x = 0 + 9
-5x = 0 + 9

Combine like terms: 0 + 9 = 9
-5x = 9

Divide each side by '-5'.
x = -1.8

Simplifying
x = -1.8

Subproblem 2
Set the factor '(4 + -1x)' equal to zero and attempt to solve:

Simplifying
4 + -1x = 0

Solving
4 + -1x = 0

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

Add '-4' to each side of the equation.
4 + -4 + -1x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1x = 0 + -4
-1x = 0 + -4

Combine like terms: 0 + -4 = -4
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4
Solution
x = {-1.8, 4}

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