=4x^3-42x^2+108x

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Solution for =4x^3-42x^2+108x equation:


Simplifying
0 = 4x3 + -42x2 + 108x

Reorder the terms:
0 = 108x + -42x2 + 4x3

Solving
0 = 108x + -42x2 + 4x3

Solving for variable 'x'.
Remove the zero:
-108x + 42x2 + -4x3 = 108x + -42x2 + 4x3 + -108x + 42x2 + -4x3

Reorder the terms:
-108x + 42x2 + -4x3 = 108x + -108x + -42x2 + 42x2 + 4x3 + -4x3

Combine like terms: 108x + -108x = 0
-108x + 42x2 + -4x3 = 0 + -42x2 + 42x2 + 4x3 + -4x3
-108x + 42x2 + -4x3 = -42x2 + 42x2 + 4x3 + -4x3

Combine like terms: -42x2 + 42x2 = 0
-108x + 42x2 + -4x3 = 0 + 4x3 + -4x3
-108x + 42x2 + -4x3 = 4x3 + -4x3

Combine like terms: 4x3 + -4x3 = 0
-108x + 42x2 + -4x3 = 0

Factor out the Greatest Common Factor (GCF), '2x'.
2x(-54 + 21x + -2x2) = 0

Factor a trinomial.
2x((-6 + x)(9 + -2x)) = 0

Ignore the factor 2.

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 '(-6 + x)' equal to zero and attempt to solve: Simplifying -6 + x = 0 Solving -6 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 0 + 6 Combine like terms: -6 + 6 = 0 0 + x = 0 + 6 x = 0 + 6 Combine like terms: 0 + 6 = 6 x = 6 Simplifying x = 6

Subproblem 3

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

Solution

x = {0, 6, 4.5}

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