(21-2x)*(15-2x)*x=

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Solution for (21-2x)*(15-2x)*x= equation: 


Simplifying
(21 + -2x)(15 + -2x) * x = 0

Reorder the terms for easier multiplication:
x(21 + -2x)(15 + -2x) = 0

Multiply (21 + -2x) * (15 + -2x)
x(21(15 + -2x) + -2x * (15 + -2x)) = 0
x((15 * 21 + -2x * 21) + -2x * (15 + -2x)) = 0
x((315 + -42x) + -2x * (15 + -2x)) = 0
x(315 + -42x + (15 * -2x + -2x * -2x)) = 0
x(315 + -42x + (-30x + 4x2)) = 0

Combine like terms: -42x + -30x = -72x
x(315 + -72x + 4x2) = 0
(315 * x + -72x * x + 4x2 * x) = 0
(315x + -72x2 + 4x3) = 0

Solving
315x + -72x2 + 4x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), 'x'.
x(315 + -72x + 4x2) = 0

Factor a trinomial.
x((15 + -2x)(21 + -2x)) = 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 '(15 + -2x)' equal to zero and attempt to solve:

Simplifying
15 + -2x = 0

Solving
15 + -2x = 0

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

Add '-15' to each side of the equation.
15 + -15 + -2x = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -2x = 0 + -15
-2x = 0 + -15

Combine like terms: 0 + -15 = -15
-2x = -15

Divide each side by '-2'.
x = 7.5

Simplifying
x = 7.5

Subproblem 3
Set the factor '(21 + -2x)' equal to zero and attempt to solve:

Simplifying
21 + -2x = 0

Solving
21 + -2x = 0

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

Add '-21' to each side of the equation.
21 + -21 + -2x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -2x = 0 + -21
-2x = 0 + -21

Combine like terms: 0 + -21 = -21
-2x = -21

Divide each side by '-2'.
x = 10.5

Simplifying
x = 10.5
Solution
x = {0, 7.5, 10.5}

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