(4x-3)(5x+9)=0

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Solution for (4x-3)(5x+9)=0 equation: 


Simplifying
(4x + -3)(5x + 9) = 0

Reorder the terms:
(-3 + 4x)(5x + 9) = 0

Reorder the terms:
(-3 + 4x)(9 + 5x) = 0

Multiply (-3 + 4x) * (9 + 5x)
(-3(9 + 5x) + 4x * (9 + 5x)) = 0
((9 * -3 + 5x * -3) + 4x * (9 + 5x)) = 0
((-27 + -15x) + 4x * (9 + 5x)) = 0
(-27 + -15x + (9 * 4x + 5x * 4x)) = 0
(-27 + -15x + (36x + 20x2)) = 0

Combine like terms: -15x + 36x = 21x
(-27 + 21x + 20x2) = 0

Solving
-27 + 21x + 20x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -5x)(3 + -4x) = 0


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 '(3 + -4x)' equal to zero and attempt to solve:

Simplifying
3 + -4x = 0

Solving
3 + -4x = 0

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

Add '-3' to each side of the equation.
3 + -3 + -4x = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -4x = 0 + -3
-4x = 0 + -3

Combine like terms: 0 + -3 = -3
-4x = -3

Divide each side by '-4'.
x = 0.75

Simplifying
x = 0.75
Solution
x = {-1.8, 0.75}

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