To solve the equation \( 3x^2 = 21 \), we first need to isolate \( x^2 \):
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Divide both sides by 3: \[ x^2 = \frac{21}{3} = 7 \]
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Now, take the square root of both sides: \[ x = \pm \sqrt{7} \]
This gives us two solutions: \( x = \sqrt{7} \) and \( x = -\sqrt{7} \).
Therefore, there are two solutions in the solution set.
The correct response is: two