(-2/5)/(√21/5) =
(-2 * 5)/(5 * √21) =
-2/√21 * 5/5 =
-2/√21 = -2√21/21
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Verified answer
(-2/5)/(√21/5) =
(-2 * 5)/(5 * √21) =
-2/√21 * 5/5 =
-2/√21 = -2√21/21