X^3+7x^2+21x-15=0

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Solution for X^3+7x^2+21x-15=0 equation:


Simplifying
X3 + 7x2 + 21x + -15 = 0

Reorder the terms:
-15 + X3 + 21x + 7x2 = 0

Solving
-15 + X3 + 21x + 7x2 = 0

Solving for variable 'X'.

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

Add '15' to each side of the equation.
-15 + X3 + 21x + 15 + 7x2 = 0 + 15

Reorder the terms:
-15 + 15 + X3 + 21x + 7x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + X3 + 21x + 7x2 = 0 + 15
X3 + 21x + 7x2 = 0 + 15

Combine like terms: 0 + 15 = 15
X3 + 21x + 7x2 = 15

Add '-21x' to each side of the equation.
X3 + 21x + -21x + 7x2 = 15 + -21x

Combine like terms: 21x + -21x = 0
X3 + 0 + 7x2 = 15 + -21x
X3 + 7x2 = 15 + -21x

Add '-7x2' to each side of the equation.
X3 + 7x2 + -7x2 = 15 + -21x + -7x2

Combine like terms: 7x2 + -7x2 = 0
X3 + 0 = 15 + -21x + -7x2
X3 = 15 + -21x + -7x2

Simplifying
X3 = 15 + -21x + -7x2

Reorder the terms:
-15 + X3 + 21x + 7x2 = 15 + -21x + -7x2 + -15 + 21x + 7x2

Reorder the terms:
-15 + X3 + 21x + 7x2 = 15 + -15 + -21x + 21x + -7x2 + 7x2

Combine like terms: 15 + -15 = 0
-15 + X3 + 21x + 7x2 = 0 + -21x + 21x + -7x2 + 7x2
-15 + X3 + 21x + 7x2 = -21x + 21x + -7x2 + 7x2

Combine like terms: -21x + 21x = 0
-15 + X3 + 21x + 7x2 = 0 + -7x2 + 7x2
-15 + X3 + 21x + 7x2 = -7x2 + 7x2

Combine like terms: -7x2 + 7x2 = 0
-15 + X3 + 21x + 7x2 = 0

The solution to this equation could not be determined.

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