[X^2-x-21]=9

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Solution for [X^2-x-21]=9 equation:


Simplifying
[X2 + -1x + -21] = 9

Reorder the terms:
[-21 + X2 + -1x] = 9

Remove brackets around [-21 + X2 + -1x]
-21 + X2 + -1x = 9

Solving
-21 + X2 + -1x = 9

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 + X2 + 21 + -1x = 9 + 21

Reorder the terms:
-21 + 21 + X2 + -1x = 9 + 21

Combine like terms: -21 + 21 = 0
0 + X2 + -1x = 9 + 21
X2 + -1x = 9 + 21

Combine like terms: 9 + 21 = 30
X2 + -1x = 30

Add 'x' to each side of the equation.
X2 + -1x + x = 30 + x

Combine like terms: -1x + x = 0
X2 + 0 = 30 + x
X2 = 30 + x

Simplifying
X2 = 30 + x

Reorder the terms:
-30 + X2 + -1x = 30 + x + -30 + -1x

Reorder the terms:
-30 + X2 + -1x = 30 + -30 + x + -1x

Combine like terms: 30 + -30 = 0
-30 + X2 + -1x = 0 + x + -1x
-30 + X2 + -1x = x + -1x

Combine like terms: x + -1x = 0
-30 + X2 + -1x = 0

The solution to this equation could not be determined.

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