x(x-4)(2x+9)=0

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Solution for x(x-4)(2x+9)=0 equation: 


Simplifying
x(x + -4)(2x + 9) = 0

Reorder the terms:
x(-4 + x)(2x + 9) = 0

Reorder the terms:
x(-4 + x)(9 + 2x) = 0

Multiply (-4 + x) * (9 + 2x)
x(-4(9 + 2x) + x(9 + 2x)) = 0
x((9 * -4 + 2x * -4) + x(9 + 2x)) = 0
x((-36 + -8x) + x(9 + 2x)) = 0
x(-36 + -8x + (9 * x + 2x * x)) = 0
x(-36 + -8x + (9x + 2x2)) = 0

Combine like terms: -8x + 9x = 1x
x(-36 + 1x + 2x2) = 0
(-36 * x + 1x * x + 2x2 * x) = 0
(-36x + 1x2 + 2x3) = 0

Solving
-36x + 1x2 + 2x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), 'x'.
x(-36 + x + 2x2) = 0

Factor a trinomial.
x((-9 + -2x)(4 + -1x)) = 0


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 + -2x)' equal to zero and attempt to solve:

Simplifying
-9 + -2x = 0

Solving
-9 + -2x = 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 + -2x = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -2x = 0 + 9
-2x = 0 + 9

Combine like terms: 0 + 9 = 9
-2x = 9

Divide each side by '-2'.
x = -4.5

Simplifying
x = -4.5

Subproblem 3
Set the factor '(4 + -1x)' equal to zero and attempt to solve:

Simplifying
4 + -1x = 0

Solving
4 + -1x = 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 + -1x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1x = 0 + -4
-1x = 0 + -4

Combine like terms: 0 + -4 = -4
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4
Solution
x = {0, -4.5, 4}

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