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

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


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

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

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

Multiply (-5 + 4x) * (9 + 3x)
(-5(9 + 3x) + 4x * (9 + 3x)) = 0
((9 * -5 + 3x * -5) + 4x * (9 + 3x)) = 0
((-45 + -15x) + 4x * (9 + 3x)) = 0
(-45 + -15x + (9 * 4x + 3x * 4x)) = 0
(-45 + -15x + (36x + 12x2)) = 0

Combine like terms: -15x + 36x = 21x
(-45 + 21x + 12x2) = 0

Solving
-45 + 21x + 12x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-15 + 7x + 4x2) = 0

Factor a trinomial.
3((-3 + -1x)(5 + -4x)) = 0

Ignore the factor 3.

Subproblem 1
Set the factor '(-3 + -1x)' equal to zero and attempt to solve:

Simplifying
-3 + -1x = 0

Solving
-3 + -1x = 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 + -1x = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1x = 0 + 3
-1x = 0 + 3

Combine like terms: 0 + 3 = 3
-1x = 3

Divide each side by '-1'.
x = -3

Simplifying
x = -3

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 = {-3, 1.25}

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