Advanced Math practice question

Answer: 11

Square both sides: 2x + 3 = 25. Then 2x = 22 and x = 11. Check: √(22 + 3) = √25 = 5.

Common wrong answers

If you answered 1

1 comes from (5 − 3)/2, forgetting to square the 5 first. The equation says the square root is 5, so the inside is 25.

If you answered 4

4 would make the inside 11, and √11 is not 5.

If you answered 14

14 is (25 + 3)/2, adding 3 instead of subtracting it. From 2x + 3 = 25, the 3 comes off: 2x = 22.

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