Advanced Math practice question

Answer: 4

Squaring both sides: 2x − 1 = x + 3, so x = 4 (and both radicands are positive).

Common wrong answers

If you answered 2

2 comes from 2x − 1 = x + 3 with a sign slip.

If you answered 3

3 sets 2x − 1 = x + 3 as x = 3 by dropping a term.

If you answered -4

−4 makes both radicands negative.

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