=7x^3-56x^2+84x

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Solution for =7x^3-56x^2+84x equation:


Simplifying
0 = 7x3 + -56x2 + 84x

Reorder the terms:
0 = 84x + -56x2 + 7x3

Solving
0 = 84x + -56x2 + 7x3

Solving for variable 'x'.
Remove the zero:
-84x + 56x2 + -7x3 = 84x + -56x2 + 7x3 + -84x + 56x2 + -7x3

Reorder the terms:
-84x + 56x2 + -7x3 = 84x + -84x + -56x2 + 56x2 + 7x3 + -7x3

Combine like terms: 84x + -84x = 0
-84x + 56x2 + -7x3 = 0 + -56x2 + 56x2 + 7x3 + -7x3
-84x + 56x2 + -7x3 = -56x2 + 56x2 + 7x3 + -7x3

Combine like terms: -56x2 + 56x2 = 0
-84x + 56x2 + -7x3 = 0 + 7x3 + -7x3
-84x + 56x2 + -7x3 = 7x3 + -7x3

Combine like terms: 7x3 + -7x3 = 0
-84x + 56x2 + -7x3 = 0

Factor out the Greatest Common Factor (GCF), '7x'.
7x(-12 + 8x + -1x2) = 0

Factor a trinomial.
7x((-6 + x)(2 + -1x)) = 0

Ignore the factor 7.

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 '(2 + -1x)' equal to zero and attempt to solve: Simplifying 2 + -1x = 0 Solving 2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1x = 0 + -2 -1x = 0 + -2 Combine like terms: 0 + -2 = -2 -1x = -2 Divide each side by '-1'. x = 2 Simplifying x = 2

Solution

x = {0, 6, 2}

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