What is the first step in solving the equation X^2 - 21 = 0?
How to solve a quadratic equation using the square root method

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Mathematics
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11th Grade - University
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Hard
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1.
OPEN ENDED QUESTION
3 mins • 1 pt
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2.
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3 mins • 1 pt
Why can't we take the square root of 21 in the context of this problem?
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3.
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3 mins • 1 pt
What is the significance of the ± symbol when solving for X?
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4.
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3 mins • 1 pt
Explain why the teacher does not want a decimal answer for sqrt(21).
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5.
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3 mins • 1 pt
How do you determine the two possible values for X when solving X^2 = 25?
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