(5x-8)(4x+9)=0

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Solution for (5x-8)(4x+9)=0 equation: 


Simplifying
(5x + -8)(4x + 9) = 0

Reorder the terms:
(-8 + 5x)(4x + 9) = 0

Reorder the terms:
(-8 + 5x)(9 + 4x) = 0

Multiply (-8 + 5x) * (9 + 4x)
(-8(9 + 4x) + 5x * (9 + 4x)) = 0
((9 * -8 + 4x * -8) + 5x * (9 + 4x)) = 0
((-72 + -32x) + 5x * (9 + 4x)) = 0
(-72 + -32x + (9 * 5x + 4x * 5x)) = 0
(-72 + -32x + (45x + 20x2)) = 0

Combine like terms: -32x + 45x = 13x
(-72 + 13x + 20x2) = 0

Solving
-72 + 13x + 20x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -4x)(8 + -5x) = 0


Subproblem 1
Set the factor '(-9 + -4x)' equal to zero and attempt to solve:

Simplifying
-9 + -4x = 0

Solving
-9 + -4x = 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 + -4x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -4x = 0 + 9
-4x = 0 + 9

Combine like terms: 0 + 9 = 9
-4x = 9

Divide each side by '-4'.
x = -2.25

Simplifying
x = -2.25

Subproblem 2
Set the factor '(8 + -5x)' equal to zero and attempt to solve:

Simplifying
8 + -5x = 0

Solving
8 + -5x = 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 + -5x = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -5x = 0 + -8
-5x = 0 + -8

Combine like terms: 0 + -8 = -8
-5x = -8

Divide each side by '-5'.
x = 1.6

Simplifying
x = 1.6
Solution
x = {-2.25, 1.6}

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