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

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


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

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

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

Multiply (4 + x) * (-9 + x)
-4x(4(-9 + x) + x(-9 + x)) = 0
-4x((-9 * 4 + x * 4) + x(-9 + x)) = 0
-4x((-36 + 4x) + x(-9 + x)) = 0
-4x(-36 + 4x + (-9 * x + x * x)) = 0
-4x(-36 + 4x + (-9x + x2)) = 0

Combine like terms: 4x + -9x = -5x
-4x(-36 + -5x + x2) = 0
(-36 * -4x + -5x * -4x + x2 * -4x) = 0
(144x + 20x2 + -4x3) = 0

Solving
144x + 20x2 + -4x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '4x'.
4x(36 + 5x + -1x2) = 0

Factor a trinomial.
4x((9 + -1x)(4 + x)) = 0

Ignore the factor 4.

Subproblem 1
Set the factor 'x' equal to zero and attempt to solve:

Simplifying
x = 0

Solving
x = 0

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

Simplifying
x = 0

Subproblem 2
Set the factor '(9 + -1x)' equal to zero and attempt to solve:

Simplifying
9 + -1x = 0

Solving
9 + -1x = 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 + -1x = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1x = 0 + -9
-1x = 0 + -9

Combine like terms: 0 + -9 = -9
-1x = -9

Divide each side by '-1'.
x = 9

Simplifying
x = 9

Subproblem 3
Set the factor '(4 + x)' equal to zero and attempt to solve:

Simplifying
4 + x = 0

Solving
4 + x = 0

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

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

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

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

Simplifying
x = -4
Solution
x = {0, 9, -4}

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