The value of AB is 4 and -4. Ella's forgot to include -4 in his solution
Given the expression solved by Ella expressed as:
AB = |-1 + 5| = 4
Since AB contains modulus sign, then the expression can either be a positive value or negative value.
If positive:
|-1 + 5|
= -1 + 5
= 4
If negative:
|-1 + 5|
= -(-1 + 5)
Expand
= 1 - 5
= -4
Hence the value of AB is 4 and -4. Ella forgot to include -4 in his solution.
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