X^3-4x^2-21=0

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Solution for X^3-4x^2-21=0 equation:


Simplifying
X3 + -4x2 + -21 = 0

Reorder the terms:
-21 + X3 + -4x2 = 0

Solving
-21 + X3 + -4x2 = 0

Solving for variable 'X'.

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

Add '21' to each side of the equation.
-21 + X3 + 21 + -4x2 = 0 + 21

Reorder the terms:
-21 + 21 + X3 + -4x2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + X3 + -4x2 = 0 + 21
X3 + -4x2 = 0 + 21

Combine like terms: 0 + 21 = 21
X3 + -4x2 = 21

Add '4x2' to each side of the equation.
X3 + -4x2 + 4x2 = 21 + 4x2

Combine like terms: -4x2 + 4x2 = 0
X3 + 0 = 21 + 4x2
X3 = 21 + 4x2

Simplifying
X3 = 21 + 4x2

Reorder the terms:
-21 + X3 + -4x2 = 21 + 4x2 + -21 + -4x2

Reorder the terms:
-21 + X3 + -4x2 = 21 + -21 + 4x2 + -4x2

Combine like terms: 21 + -21 = 0
-21 + X3 + -4x2 = 0 + 4x2 + -4x2
-21 + X3 + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
-21 + X3 + -4x2 = 0

The solution to this equation could not be determined.

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