Question

What are the solutions to the equation x^2-1=399

Answer 1

x = 20

Explanation:

• what are the solutions to the equation x^2-1=399

x² - 1 = 399

x² = 399 + 1

x² = 400

x = √400

x = 20

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check

20² - 1 = 399

400 - 1 = 399

399 = 399