Square Expansion

Level 2

If 99999999 8 2 = x 999 999 998^2 = x , which is equivalent to 99999999 9 2 999 999 999^2 ?

x + 999 999 999 x + 1 999 999 997 x 2 + 1999999997 x^2 + 1 999 999 997 x 2 + 999999999 x^2+ 999 999 999

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