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

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


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

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

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

Multiply (-5 + 4x) * (9 + 8x)
(-5(9 + 8x) + 4x * (9 + 8x)) = 0
((9 * -5 + 8x * -5) + 4x * (9 + 8x)) = 0
((-45 + -40x) + 4x * (9 + 8x)) = 0
(-45 + -40x + (9 * 4x + 8x * 4x)) = 0
(-45 + -40x + (36x + 32x2)) = 0

Combine like terms: -40x + 36x = -4x
(-45 + -4x + 32x2) = 0

Solving
-45 + -4x + 32x2 = 0

Solving for variable 'x'.

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


Subproblem 1
Set the factor '(-9 + -8x)' equal to zero and attempt to solve:

Simplifying
-9 + -8x = 0

Solving
-9 + -8x = 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 + -8x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -8x = 0 + 9
-8x = 0 + 9

Combine like terms: 0 + 9 = 9
-8x = 9

Divide each side by '-8'.
x = -1.125

Simplifying
x = -1.125

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 = {-1.125, 1.25}

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