How to solve a quadratic equation using the square root method

The video tutorial guides students through solving the equation X^2 - 21 = 0. It explains the process of setting Y to zero, solving for X by taking the square root, and understanding why the square root of 21 cannot be simplified. The importance of considering both positive and negative roots is highlighted, with examples provided. The tutorial concludes with a brief mention of graphing solutions.

What is the first step in solving the equation X^2 - 21 = 0?

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Why can't we take the square root of 21 in the context of this problem?

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What is the significance of the ± symbol when solving for X?

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Explain why the teacher does not want a decimal answer for sqrt(21).

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How do you determine the two possible values for X when solving X^2 = 25?

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