Having tutored my 13-year-old daughter through algebra this school year, a common mistake is flipping this into a square-root problem.
As asked, the question is about mappings ℝ+ → ℝ ⨯ ℝ ∪ {0}. Square root is different, mapping ℝ+ → ℝ+ ∪ {0}. The question could have been sloppily worded or someone trying to make it look more “mathy.”
When I tell my daughter that negative numbers have square roots too and are imaginary, she rolls her eyes and sighs.
As asked, the question is about mappings ℝ+ → ℝ ⨯ ℝ ∪ {0}. Square root is different, mapping ℝ+ → ℝ+ ∪ {0}. The question could have been sloppily worded or someone trying to make it look more “mathy.”
When I tell my daughter that negative numbers have square roots too and are imaginary, she rolls her eyes and sighs.