[(9r-s)+2][(9r-s)-2]=0

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Solution for [(9r-s)+2][(9r-s)-2]=0 equation: 


Simplifying
[(9r + -1s) + 2][(9r + -1s) + -2] = 0

Remove parenthesis around (9r + -1s)
[9r + -1s + 2][(9r + -1s) + -2] = 0

Reorder the terms:
[2 + 9r + -1s][(9r + -1s) + -2] = 0

Remove parenthesis around (9r + -1s)
[2 + 9r + -1s][9r + -1s + -2] = 0

Reorder the terms:
[2 + 9r + -1s][-2 + 9r + -1s] = 0

Multiply [2 + 9r + -1s] * [-2 + 9r + -1s]
[2[-2 + 9r + -1s] + 9r * [-2 + 9r + -1s] + -1s * [-2 + 9r + -1s]] = 0
[[-2 * 2 + 9r * 2 + -1s * 2] + 9r * [-2 + 9r + -1s] + -1s * [-2 + 9r + -1s]] = 0
[[-4 + 18r + -2s] + 9r * [-2 + 9r + -1s] + -1s * [-2 + 9r + -1s]] = 0
[-4 + 18r + -2s + [-2 * 9r + 9r * 9r + -1s * 9r] + -1s * [-2 + 9r + -1s]] = 0

Reorder the terms:
[-4 + 18r + -2s + [-18r + -9rs + 81r2] + -1s * [-2 + 9r + -1s]] = 0
[-4 + 18r + -2s + [-18r + -9rs + 81r2] + -1s * [-2 + 9r + -1s]] = 0
[-4 + 18r + -2s + -18r + -9rs + 81r2 + [-2 * -1s + 9r * -1s + -1s * -1s]] = 0

Reorder the terms:
[-4 + 18r + -2s + -18r + -9rs + 81r2 + [-9rs + 2s + 1s2]] = 0
[-4 + 18r + -2s + -18r + -9rs + 81r2 + [-9rs + 2s + 1s2]] = 0

Reorder the terms:
[-4 + 18r + -18r + -9rs + -9rs + 81r2 + -2s + 2s + 1s2] = 0

Combine like terms: 18r + -18r = 0
[-4 + 0 + -9rs + -9rs + 81r2 + -2s + 2s + 1s2] = 0
[-4 + -9rs + -9rs + 81r2 + -2s + 2s + 1s2] = 0

Combine like terms: -9rs + -9rs = -18rs
[-4 + -18rs + 81r2 + -2s + 2s + 1s2] = 0

Combine like terms: -2s + 2s = 0
[-4 + -18rs + 81r2 + 0 + 1s2] = 0
[-4 + -18rs + 81r2 + 1s2] = 0

Solving
-4 + -18rs + 81r2 + 1s2 = 0

Solving for variable 'r'.

The solution to this equation could not be determined.

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