3x(5+x)(x-7)=0

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Solution for 3x(5+x)(x-7)=0 equation: 


Simplifying
3x(5 + x)(x + -7) = 0

Reorder the terms:
3x(5 + x)(-7 + x) = 0

Multiply (5 + x) * (-7 + x)
3x(5(-7 + x) + x(-7 + x)) = 0
3x((-7 * 5 + x * 5) + x(-7 + x)) = 0
3x((-35 + 5x) + x(-7 + x)) = 0
3x(-35 + 5x + (-7 * x + x * x)) = 0
3x(-35 + 5x + (-7x + x2)) = 0

Combine like terms: 5x + -7x = -2x
3x(-35 + -2x + x2) = 0
(-35 * 3x + -2x * 3x + x2 * 3x) = 0
(-105x + -6x2 + 3x3) = 0

Solving
-105x + -6x2 + 3x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3x'.
3x(-35 + -2x + x2) = 0

Factor a trinomial.
3x((-5 + -1x)(7 + -1x)) = 0

Ignore the factor 3.

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 '(-5 + -1x)' equal to zero and attempt to solve:

Simplifying
-5 + -1x = 0

Solving
-5 + -1x = 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 + -1x = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -1x = 0 + 5
-1x = 0 + 5

Combine like terms: 0 + 5 = 5
-1x = 5

Divide each side by '-1'.
x = -5

Simplifying
x = -5

Subproblem 3
Set the factor '(7 + -1x)' equal to zero and attempt to solve:

Simplifying
7 + -1x = 0

Solving
7 + -1x = 0

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

Add '-7' to each side of the equation.
7 + -7 + -1x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -1x = 0 + -7
-1x = 0 + -7

Combine like terms: 0 + -7 = -7
-1x = -7

Divide each side by '-1'.
x = 7

Simplifying
x = 7
Solution
x = {0, -5, 7}

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