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

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


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

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

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

Multiply (5 + 4x) * (-9 + 5x)
(5(-9 + 5x) + 4x * (-9 + 5x)) = 0
((-9 * 5 + 5x * 5) + 4x * (-9 + 5x)) = 0
((-45 + 25x) + 4x * (-9 + 5x)) = 0
(-45 + 25x + (-9 * 4x + 5x * 4x)) = 0
(-45 + 25x + (-36x + 20x2)) = 0

Combine like terms: 25x + -36x = -11x
(-45 + -11x + 20x2) = 0

Solving
-45 + -11x + 20x2 = 0

Solving for variable 'x'.

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


Subproblem 1
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

Subproblem 2
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
Solution
x = {-1.25, 1.8}

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